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Quality Planning

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Assignment Cover Sheet

STANDARD and BLOCK Mode

SUBJECT NAME:

QUALITY PLANNING AND ANALYSIS

SUBJECT NUMBER:

49309

ASSIGNMENT NUMBER:

ASSIGNMENT 1

STUDENT LAST NAME:

LUU

STUDENT FIRST NAME: THIET XIEU

STUDENT ID:

11311848

Declaration of Originality:

The work contained in this assignment, other than that specifically attributed to another source, is that of the author(s) and has not been submitted in any other subject or published elsewhere before. It is recognised that, should this declaration be found to be false, disciplinary action could be taken and penalties imposed in accordance with University policy and rules.

Signature: __________________________________

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TABLE OF CONTENTS
1. 2. Introduction ................................................................................................................... 3 Customer satisfaction ..................................................................................................... 5
2.1 2.2 2.3 Stakeholder identification ................................................................................................... 5 Methods for capturing customer needs................................................................................ 6 Customer needs identification ............................................................................................ 9

3.

Design requirements .................................................................................................... 13
3.1 3.2 Quality function deployment (QFD) ................................................................................. 13 Failure Mode and Effect Analysis (FMEA) ...................................................................... 15

4.

Suppliers selection and evaluation ................................................................................ 17
4.1 4.2 4.3 4.4 Components identifications .............................................................................................. 17 Suppliers selection criteria................................................................................................ 17 Suppliers selection system ................................................................................................ 17 Suppliers selection outcome analysis ................................................................................ 18

5.

Statistical process control ............................................................................................. 20
5.1 5.2 Process identification ....................................................................................................... 20 Statistical control charts ................................................................................................... 21

5.3 6.

Statistical process control ......................................................................................... 23 Continuous improvement ............................................................................................. 25

6.1 6.2

Problems and problem solving tools ................................................................................. 25 Problem solving tools application ..................................................................................... 25

7.

References ................................................................................................................... 29

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List of Figures

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Figure 1 Process of customer needs identification ............................................................................................. 9 Figure 2 Voice of customer chart .................................................................................................................... 12 Figure 3 Product producing process ............................................................................................................... 20 Figure 4 np-Charts ......................................................................................................................................... 24 Figure 5 Pareto Chart .................................................................................................................................... 27

List of Tables
Table 1 Stakeholders Identification and relative expectations _______________________________________ 6 Table 2 MUSTs identification and related scores________________________________________________ 10 Table 3 WANTs identification and related scores _______________________________________________ 11 Table 4 DESIRABLEs identification and related scores __________________________________________ 11 Table 5 Adjustment factor of different requirements _____________________________________________ 13 Table 6 QFD chart _______________________________________________________________________ 15 Table 7 FMEA chart ______________________________________________________________________ 16 Table 8 Supplier Selection and evaluation criteria with relative scores ______________________________ 18 Table 9 np-Charts data ____________________________________________________________________ 23 Table 10 Check sheet _____________________________________________________________________ 26

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1. Introduction
This report will discuss the Asus Transformer Pad Infinity tablet (TF700T) which is developed and produced by ASUS TeK Computer Inc., commonly known as Asus. This product was released globally in August, 2012. Asus Transformer Pad Infinity is the latest version of one of the best-selling tablet Asus Transformer series.

1.1 Product description
Like some previous models, Asus Transformer Pad Infinity is a 10.1-inch tablet with a detachable keyboard dock which adds a USB port, a track pack and built-in battery. In terms of processor, this product uses the latest Qualcomm Dual-core 1.5Ghz CPU and 1GB DDR3L RAM which enable product to run several apps at the same time smoothly. According to Asus, the battery of this product can last for 10 hours without keyboard dock and up to 16 hours if the keyboard dock is connected. This model is available for variety of internal storage; 32 and 64GB as well as micro SD card slot for the external memory. The size of the tablet is 263mm in length, 180.8mm in width, 8.5mm in thickness and just weight 598 grams. The back of the product is made by aluminium with swirl design to resist scratch. Another impressive feature of this product is the Full High Definition display (1920 x 1200) with LED Backlift, scratch resistant and 10-finger multi-touch screen and so, customers can enjoy high quality movies or videos with this portable device. Customers can take high quality photo with the product as it provides 8 megapixels camera with flash on the back and 2 megapixels camera at front. The product is installed and compatible with Google’s Android 4.0 Ice Cream Sandwich operation system – one of the most popular systems for mobile devices. Also, other with some built-in apps, there are a huge number of Android apps (more than 550,000 apps) available for customers to download. Additionally, this product provides wireless internet connection, GPS and SD card reader.

1.2 Targeted markets customers
With the external keyboard dock, the Asus Transformer Pad Infinity can be seen as a part notebook, part table which provides a most comfortable environment for customers to work, study, read, play games and entertain. This product can satisfy different groups of customers not only organisations but also individual customers. Also, the Asus TF700T can attract a wide range of customers for different using purpose, including business people, students as well as home users.

1.3 Strengths
      Availability of various apps can satisfy different needs from different customers; Mobility, portability of the device; Ability to connect to external storage; Compatibility of the most popular operation system (Android); A large numbers of free apps available; Powerful processor and RAM can support any using purposes;

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    Full HD 1080p LED screen enables high quality graphic enjoys; External keyboard dock provides a faster data input; Long battery life; Scratch resistance touch screen.

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1.4 Weaknesses
   Unable for 3G/cellular network connection; Graphic resolution still low in comparison to main competitor (the new iPad); Operation system is still lack of consistence.

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2. Customer satisfaction
2.1 Stakeholder identification
In definition, stakeholder is a group or individual who can or can be affected by the activities of the company around the product, including design, sale, marketing, etc. In the development, manufacturing of the Asus Transformer Pad Infinity, there are many different stakeholders may influence those processes and are listed in table 1 below: Number Stakeholders Relative Expectations Asus employees 1 - High salaries - Reasonable working time - Security of jobs - Training opportunities provided by company - Safety of working environment - Competitive working environment - Sufficient working insurance - Promotion opportunities - Good reputation of company Customers (end-users) 2 - Reasonable prices - Consistence of product - Long product’s life-time - Long warranty period - Good post-sale service - Good customer service - Good performance of product - Good reputation of product and company Suppliers of components 3 - Long term contract - Payment on time - Continuous collaboration - High volumes of orders - Consistence of technical requirements Local Government 4 - High tax payments due to large volume of sales - On time tax payment - Compliance with regulations and rules - Local activities support - Job opportunities for local residents Competitors 5 - Failure of product - Low market share - Fair competitive environment Company’s shareholders 6 - Good reputation of company and product - Low risk product - High return on investment - High share prices

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7

8

9

10

- High dividends - Good image of product - High profit, low cost product - Low risk product - High market share - High share prices - High customer satisfactions EPA (Environmental - Environmental friendly product Protection Authority) - Compliance with environmental regulations or guidance - Low pollution - Recyclability of product’s materials - Low environmental impact Mid-level customers - On time delivery (retailers) - Reasonable prices - Good reputation of product - Sufficient warranty - Availability of product Transport companies - Long term contract - Continuous delivery orders - On time payments Table 1 Stakeholders Identification and relative expectations Management

2.2 Methods for capturing customer needs
For product manufacturing and development, it is important to identify customer needs in order to fulfil their satisfaction. Company will be able to success if it appropriately satisfies the requirements from customers. According to Akpolat (2004), there are several methods can be used to capture customers’ needs and satisfactions:          Customer interviews Customer focus groups Benchmarking Warranty claims Customer complaints Market trend analysis Customer questionnaires Mystery shoppers or callers Customer visits

2.2.1 Customer interviews According to Akpolat (2004), “customer interviews” is the process which includes face to face interviews or phone calls. Although this is a timeconsuming method, it is widely being used because it is able to generate and identify qualitative data. Also, it is necessary to note that in order to conduct this method; company needs to follow following steps:

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     Identify purpose of the interview Generate appropriate list of questions Select appropriate customers Identify the role of interviewers Expect outcomes

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2.2.2 Customer focus groups According to Akpolat (2004), customer focus groups can be formed by five to eight customers who will be asked for their views in the surveys in order to collect the opinions, views of customers for certain products or services. In several cases, this type of interview can be conducted through breakfast or lunch session between customers and management staff of the company in order to collect the responses of customers about their views and problems with products or services. Also, this method can develop and strengthen the relationship between company and customers. 2.2.3 Benchmarking In terms of benchmarking method, Akpolat (2004) points out that this method is used to compare the performance of products or services of different companies. By conducting this method, company will be able to identify the advantages and disadvantages of products and therefore, it is possible to find out appropriate improvements and developments. However, this method might be difficult to be conducted because the related information of other companies’ products would be sensitive or confidential and so, very hard to collect. The implementation of this method will involve following steps:      Define improvement areas Identify the ‘benchmark’ Measure and collect relative data and information Adopt data and information Follow up

2.2.4 Warranty claims According to Akpolat (2004), “warranty claims” can be used for identifying shortcomings of products by providing customers a list of specific performance which the products can achieve. This type of method is also able to find out the reasons why the product fails or why customers dissatisfy of certain features of product. 2.2.5 Customer complaints Normally, customers may only complain about the product when they really dissatisfy with certain features of product or the product itself. Therefore, these types of complaints from customers can provide

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opportunities for company to identify the shortcomings of product in order to improve them. However, in fact, the staffs who are going to deal with customer complaints may feel annoying and so, negative responses to customers may occur. Therefore, appropriate trainings for staff in terms of customer needs may be necessary in order to handle and respond to customers positively. 2.2.6 Market trend analysis Market trend analysis is the method which needs the company to conduct the market research on a regular basis in order to identify the real situation of the product in market. This type of analysis or research may involve a wide range of areas, including market demand, prices trend, market performance, consumer analysis, etc. 2.2.7 Customer questionnaires Customer surveys or questionnaires are the lists of questions which can effectively capture customers’ needs, views and opinions about the performance and problems of product in order to help company to understand customers’ needs and their behaviours. This method can be conducted via a five-step process:      Define goals and objectives Develop plan for survey Design and test the questionnaire Carry out the survey Analyse the results of survey

2.2.8 Mystery shoppers/callers According to Akpolat (2004), mystery shoppers may be used to collect the information about the products or services at the front line. In practice, “mystery shoppers” can be some professional people who are hired by company or other agency companies in order to conduct and collect relative data and information. The disadvantage of this method is that this can only obtain a small sample size and can be very expensive. 2.2.9 Customer visits According to Cooper and Edgett (2008), in this approach, a crossfunctional visit teams (typically three people) visit customers for undertaking in-depth interviews in order to identify customers’ problems, needs and wants for the products. The main advantage of this method is that it is able to identify and focus on customers’ needs. However, it is difficult to get customers into interview sessions.

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As mentioned in previous part, there are many different method can be used to capture customers’ needs. In this report, for capturing customers’ ideas for Asus Transformer Pad Infinity TF700T, customer interviews will be adopted and conducted. The process of will be shown in Figure 1 below:

Define goals and objectives Design the interviews Carry out the interviews

Analyse the results
Identify customer needs
Figure 1 Process of customer needs identification 2.3.1 Step 1: Define goals and objectives The major goal of this survey is to identify the customers’ needs for this product, what they want about this product? From the results of this interview, company is able to translate several needs of customers into the design requirements of this product. By doing this, the product will capture customers’ needs and so, product can be accepted by customers and risks will be reduced or minimised. 2.3.2 Step 2: Design the questionnaire In this step, the goals of this interview will be translated into a list of questions. Those questions will be categorised into three groups for three categories of customer needs based on Kano analysis which are MUSTs, WANTs and DESIRABLEs. Specifically, 500 customers from 5 different countries (United States, China, Australia, Germany and South Africa) will be chosen to participate in this interview. They will be asked to score for the importance of different features of the product. Then, company will collect the result and calculate the average score of each feature in order to identify 25 most important customer needs (10 for MUSTs, 10 for WANTs and 5 for DESIRABLEs). 2.3.3 Step 3: Carry out the interview Staff of the company brand in those particular countries will occur in some particular product retail stores to find out some potential customers to

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participate in this interview. The interview will be conducted within those stores. 2.3.4 Step 4: Analyse the results The results of interviews will be collected to headquarter of the company. Then, the average score will be calculated. 2.3.5 Step 5: Identify customer needs Based on the average score, 25 customers’ needs will be taken into the VOC chart in order to identify 5 different groups of customer needs for the Kano analysis. Following 3 tables show the questions were asked in the interview and the related scores. What will be unacceptable if it is missed in the product? (MUSTs) Score (1-10) Feature 6.2* 3.2 megapixels back camera 9.5 WIFI network connection 8.5 4 GB built-in storage 9.2 Connectivity with PC 9.8 Operation system 5.8* Hand-free earphone included 6.5* 20mm thickness 8.8 1 year warranty 7.6 Sensitivity of touch screen 8.8 Charger included 6.0* Bluetooth connection 7.9 Built-in speaker 9.3 1 core CPU 7.7 800 x 480 graphic resolution 6.5* Weight of max 1kg Table 2 MUSTs identification and related scores

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What feature will you expect to be appeared in the product? (WANTs) Score (1-10) Feature 7.2* GPS 8.2 Scratch proof touch screen 9.1 Android 3.0 operation system 9.5 Front camera 9.5 10 hours battery life 7.1* 10-inch display screen 8.5 Consistent operation system 7.8 2 cores CPU 8.2 LCD display screen 8.5 1280 x 800 graphic resolution 9.4 Storage expansion 7.2* 512MB of RAM 8.5 External keyboard dock 7.3* Accessibility to the latest apps 7.7* Short charging time (less than 4 hours) Table 3 WANTs identification and related scores

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What feature will surprise you if it appears? (DESIRABLEs) Score (1-10) Feature 8.5 Voice control 9.0 Full HD graphic resolution 8.5 2 years warranty 8.0* 8 megapixels back camera 8.5 Long battery life 6.5* Stereo built-in speaker 7.2* 4 cores operation system 8.8 3G/cellular network connectivity 8.2* USB connection 7.5* Environmental friendly materials (recyclable materials) Table 4 DESIRABLEs identification and related scores Figure 2 below shows the VOC chart of customer needs for the product based on the Kano analysis

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MUSTs
          Wifi connection 4GB built-in storage Connectivity with PC Operation system 1 core CPU 1 year warranty Sensitivity of touch screen Charger included Built-in speaker 800 x 480 graphic resolution

Voice of Customer

WANTs
          Scratch proof touch screen Android 3.0 operation system Front camera 10 hours battery life Consistent operation system 2 cores CPU LCD display screen Storage expansion External keyboard dock

1280 x 800 resolution

DESIRABLEs
     Voice control Full HD graphic resolution 2 years warranty Long battery life 3G/cellular network

Figure 2 Voice of customer chart

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3. Design requirements
3.1 Quality function deployment (QFD)
The QFD chart, in this case, is used to identify the technical design requirements for the company based on the customer needs listed above. The importance rating of customer requirements are based on the scores collected through the interview and the adjustment factors. These adjustment factors are used to differentiate the importance of each category of requirement and are different for different group of requirements (MUSTs, WANTs and DESIRABLEs). Therefore, the importance ranting in QFD chart can be calculated via following formula: Important rating = Score of requirement x adjustment factor The adjustment factors will be shown in table 5 below: Requirements Adjustment factors MUSTs WANTs 1 0.7 Table 5 Adjustment factor of different requirements DESIRABLEs 0.5

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Design Requirements

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Keyboard dock & built-in battery

Customer Requirements
Wifi connection 4GB built-in storage Connectivity with PC Operation system 1 core CPU 1 year warranty Sensitivity of touch screen Charger included Built-in speaker 800 x 480 graphic resolution Scratch proof of touch screen Android 3.0 operation system Front camera 10 hours battery life 9.5 8.5 9.2 9.8 9.3 8.8 7.6 8.8 7.9 7.7 5.7 6.4 6.7 6.7 6.0 5.5 5.7 6.6 6.0 6.0

9 9 9 9 9 9 9 9 9 9 9 9 9 9 3 9 9 3 3 9 9 3 9 3 9 1

Musts

Wants

Consistent operation system 2 cores CPU LCD display screen Storage expansion External keyboard dock 1280 x 800 resolution

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Marketing & customer service

8MP camera & front camera

Scratch proof Touchscreen

Nvidia Tegra 3 T33 CPU

Wifi/3G connectivity

Android 4.0 system

Built-in storage

Accessories’ kit

Full HD display

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Voice control Full HD graphic resolution 4.3 4.5 4.3 4.3 4.4

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9 9 9 9 9 8MP camera & 2 MP front camera External keyboard & 16-hour battery Short response time (1 ms) 1980 x 1080 graphic resolution USB cable, micro SD card, charger 1 year warranty & extension discount 117.9

Desirables

2 years warranty Long battery life 3G/cellular network

Standard Wifi/3G connection

Target value

151.2 Absolute score (total)

256. 5

215. 1

142.8 143.1

181. 8

60.3

283. 5

Table 6 QFD chart

3.2 Failure Mode and Effect Analysis (FMEA)
From the QFD chart above, five design requirements with highest absolute score are chosen to the FMEA in order to identify relative technical risks and the relative actions for avoiding those risks.

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32/64 GB built-in storage 76.5

90% consistence

1.5 Ghz

P P Keyboard cannot be detected Cannot input data/No external battery Keyboard connector broken 2 4 8 Use other types of connectors 1 S R P S 4 Tablet hangs when using Needs to reset tablet/system Coding errors/affected by virus 3 4 12 Sufficient tests before sales 2 4 Black spots appear in screen Customers get annoying Dead pixels 4 2 8 Use other material for transistors 3 2

S

Part or function R 4

Potential failure

Effect on system

Root Cause of failure

Risk before Action taken

Action to reduce risk

Risk after action taken

External keyboard dock

Probability (chance) of occurrence

Seriousness of (effect) failure

Android 4.0 system

8

1 Low

Minor

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Table 7 FMEA chart
Accessories missing Customer disatisfy Inspection failure 1 2

Full HD display

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Accessories kit

2

Increase inspection when packing

1

2

2

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2 3 4 Low to Moderate Moderate moderate to high Minor to Serious Serious to serious critical

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CPU overheat

Nvidia Tegra 3 T33

Product automatically shut down

Cooling system fails

1

5

5

Increase failure inspection/ samplings

1

5

5

5 High

Critical

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4. Suppliers selection and evaluation
4.1 Components identifications
This product includes following main components:  Touchscreen  Processor  RAM  Operation system  Speaker  Camera  Hard drive  Motherboard  External keyboard  External memory

4.2 Suppliers selection criteria
In this report, operation system is chosen to develop the criteria for selection of suppliers for this particular component. For choosing the suppliers of operating system, the following criteria will be considered:           Price of product Availability of product Post-sale service of suppliers Compatibility of product with hardware Easy to update Compatibility of product with software Security of the system On time delivery Stability of the system Return policy

4.3 Suppliers selection system
In terms of operating system, there are many manufacturer can provide products with high quality. Therefore, developing a supplier selection system will facilitate company for choosing the right and reliable supplier. In this report, each supplier will be scored from 1 to 10 for each selection criteria. As a result, the supplier which has the highest total score will be chosen. For producing operating system, there are three main suppliers are available in the market: Apple, Google and Microsoft. Table 8 below shows the score of suppliers for different criteria.

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Selection and Company Name Evaluation Criteria APPLE GOOGLE MICROSOFT 5 10 6 Price 1 9 8 Availability 9 9 9 Post-sale service 9 9 9 Compatibility with hardware 9 9 7 Compatibility with software 10 7 6 Easy to update 9 7 7 Security 9 9 9 On time delivery 10 7 8 Stability of system 9 9 9 Return policy 80 78 TOTAL 85 Table 8 Supplier Selection and evaluation criteria with relative scores

4.4 Suppliers selection outcome analysis
Each company will be scored for each criterion and then the company with highest total score will be chosen. The scoring process will be explained below. 4.4.1 Price For the price of the operating system, while Android system from Google can be purchased for free, company needs to pay for every system if purchasing from Apple or Microsoft. Therefore, Google with Android system will get the highest score. 4.4.2 Availability In practice, company cannot purchase the iOS system from Apple because this product can only be used for Apple’s tablet. Therefore, it is unavailable to get this product and Apple will get lowest score in this field. On the other hand, it is possible to purchase a large amount of operating system from Google and Microsoft and so, they will get quite high score in this criterion (9 for Google and 8 for Microsoft). 4.4.3 Post-sale service All three suppliers (Apple, Google and Microsoft) have a good reputation on the post-sale service and customer satisfaction. Therefore, they will have high score (9 for all three companies) in this criterion. 4.4.4 Compatibility with hardware All three companies have a lot of experiences in coding operating system for tablet and so, those products would be compatible with all the hardware in the market. As a result, they will get 9 for the compatibility of the operating systems with hardware.

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4.4.5 Compatibility with software In the apps market, it is possible to find over 500,000 apps which are available for Android and iOS system while just only a few numbers of apps are compatible with Windows Mobile system form Microsoft. From customers’ point of view, the availability of apps is the important criterion when they decide to purchase the tablet. Therefore, both Apple and Google will get 9 and 7 for Microsoft. 4.4.6 Easy to update Apple with its iOS system is widely known as the operating system which can be updated easily for free. Customers can get the up-to-date system by just clicking update system on the iTunes software. Meanwhile, it is not only difficult to update the system for either Android or Windows Mobile; but customers also need to pay for the latest versions of those operating systems. Therefore, Apple will get the highest score (10) and Google and Microsoft will get 7 and 6 respectively. 4.4.7 Security Because iOS system is well-known as the ‘virus resistance’ system, this system is very secure and almost free from virus. Therefore, Apple will get 9 for the security. On the other hand, both Android and Windows system can be attacked by virus. This results in the score which is 7 for both Google and Microsoft. 4.4.8 On time delivery On time delivery is the very important criterion in selecting the suppliers. All three companies are big companies and they have already recognised the importance of delivery on time. However, delay in delivery sometimes may be out of control. Therefore, all three companies will get 9 in this criterion. 4.4.9 Stability of the system In this criterion, iOS seems to be the most consistent system while Android is sometimes complained by customers for lacking consistence when operating. On the other hand, Microsoft cannot be as consistent as Apple but they have received fewer complaints than Google. Therefore, Apple, Google and Microsoft will get 10, 7 and 8 respectively. 4.4.10 Return policy All three companies have very good return policy. So, they both get 9 for this criterion. According to table 8 above, Google with the Android system get the highest total score (85) compared with Google and Microsoft. Therefore, Android system will be chosen for the Asus Transformer Pad Infinity TF700T tablet.

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5. Statistical process control
5.1 Process identification
The Asus Transformer Pad Infinity TF700T is produced based on the following process which includes 11 sub-processes like Figure 3 shows below:

Product development

Assembly line setup

Products assembly

Product design

Suppliers evaluation & seletion Component suppiers nomination

Marketing plan development

Design review

Products selling

Product virtual testing

Components identification

Figure 3 Product producing process 5.1.1 Product development process This is the process in which company’s management and board of directors will decide whether or not should develop this product by predicting the profits and the possible financial risks of this product. 5.1.2 Product design process After the product development proposal has been approved by the board of directors, this project will go to the next step – product design. In this process, design team will start working on the design of the appearance of the whole product. 5.1.3 Design review Once the design of the product has finished, the design proposal of the product will be sent to engineering department in which the design will be reviewed and evaluated. This process will ensure the design of the product can fulfil the practical engineering requirements. Otherwise the design team needs to change the design in order to fit with practical requirements.

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5.1.4

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Product virtual testing After finishing the design stage, product will go to the virtual testing process. All the specifications and design data of the product will be input to the computer in order to conduct the virtual technical test. If those input data cannot pass the technical requirement of this type of test, the design and review teams need to redo their jobs. Once the product can pass the virtual test, then this design would become the final design for the product.

5.1.5 Components identification process After all the design stuff complete, company needs to define all the necessary components for the product based on the final design sketch. 5.1.6 Component suppliers nomination process Once all the components of the product have been defined, the Asus Company needs to organise the nomination for suppliers for each component of the product. 5.1.7 Suppliers evaluation and selection In this process, company needs to evaluate all the suppliers based on the suppliers nomination system described above in order to select the best supplier for each component of the product. 5.1.8 Assembly line setup process Then, company needs to go to the assembly line setup process in which the assembly line for assembling the products will be built. 5.1.9 Products assembly After all the necessary components have been delivered to the company, all components will be assembled to build to products. 5.1.10 Marketing plan development In this process, marketing department of the company has to develop the marketing plan for selling the products. This process can be conducted when the final design of the product has been approved. 5.1.11 Product selling process Finally, the products will be placed in the market and sold to the customers via retailers or the direct stores of the company.

5.2 Statistical control charts
In statistical process control, control charts are being used widely to determine and monitor whether or not the process is under control. If the process is out of control, by using the charts, the variance and problems can be identified. Depending on the process observation type, control charts are divided into two main categories: variables and attributes.

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 

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Variables control charts include: - and R-Charts, - and s-Charts, xCharts, etc. Attributes control charts include: p-Charts, np-Charts, c-Charts, u-Charts, etc. - and R-Chart - and R-chart is also being called as X-bar and R-Chart. According to Montgomery and Douglas (2005), this chart is used for the small (n 10) and variable. The chart also consist two charts which are used for monitoring the standard deviation and the mean of process. Other characteristics of this chart are similar to the Xbar and R-Chart.

5.2.1

5.2.2

5.2.3 x-Charts Like two types of charts described above, x-Chart is used for monitoring the process based on the variable data. By using this chart, only one sample is needed to measure the process. In the chart, the central line is the average value of all data. Also, the standard deviation is used to calculate the Lower Control Limit (LCL) and Upper Control Limit (UCL). 5.2.4 p-Charts In statistical process control, p-Chart is being used for monitoring the process based on the attribute data. For applying this chart, the number of defective items in a certain period needs to be collected in order to calculate the proportion of defective items and the average proportion of defective items. It is also necessary to note that the UCL and LCL for each subgroup have to be calculated separately. 5.2.5 np-Charts Like p-Charts, np-Charts are also being used to monitor the process based on the attribute data by collecting the number of defective items in a certain period of time. However, unlike p-Charts, the size of sample must be constant and therefore, the UCL and LCL are relatively constant. Other characteristics of np-Charts are similar to p-Charts.

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5.2.6 c-Charts c-Charts are being used for monitoring the process based on the attribute data by determining the number of defects on items. Then the number of defects will be plotted to the chart in order to calculate the average number of defects. In c-Charts, the size of sample must be fixed and so, the UCL and LCL will be constant. 5.2.7 u-Charts Like c-Charts, u-Charts are being used for monitoring the process based on the attribute data by counting the number of defects on items. However, the size of sample in u-Charts is not fixed. Other characteristics of u-Charts are similar to c-Charts.

5.3 Statistical process control
Because tablet is the electronic products, only one defect on the item may lead to failure of product. Also, the manufacturing process is based on attribute data. Therefore, np-Charts are considered as a most appropriate tool for monitoring the process. Workers are asked to count the number of defective product over 100 products which are selected randomly every working day. In this report, the npCharts will be monitored within 15 working days. Day Number of defective items x 8 11 10 8 11 9 7 9 12 12 11 9 8 12 11 Sample size Proportion Average of defective defective items items p_bar = n*p_bar = ∑x/∑n ∑x/k 0.1850 9.8667 0.1850 9.8667 0.1850 9.8667 0.1850 9.8667 0.1850 9.8667 0.1850 9.8667 0.1850 9.8667 0.1850 9.8667 0.1850 9.8667 0.1850 9.8667 0.1850 9.8667 0.1850 9.8667 0.1850 9.8667 0.1850 9.8667 0.1850 9.8667 Table 9 np-Charts data Upper control limit UCL 18.3738 18.3738 18.3738 18.3738 18.3738 18.3738 18.3738 18.3738 18.3738 18.3738 18.3738 18.3738 18.3738 18.3738 18.3738 Lower control limit LCL 1.3595 1.3595 1.3595 1.3595 1.3595 1.3595 1.3595 1.3595 1.3595 1.3595 1.3595 1.3595 1.3595 1.3595 1.3595

k 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

n 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100

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20
18 16 14 12 10 8 6 4

x n*p_bar UCL

LCL

2
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Figure 4 np-Charts According to the np-Charts above, the x line is fluctuating stably and the variance between the highest and lowest number of defective items and the average value is not high (around 3 items). Therefore, it is possible to conclude that the manufacturing process is working properly and the process is under control.

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6. Continuous improvement
6.1 Problems and problem solving tools
Followings are some typical problems that users have found when using the Asus Transformer Pad Infinity TF700T:  Short battery life  External keyboard dock cannot be detected  Product hangs when using  Black spots appear on the display screen  Product overheating According to Barra (1983), there are seven typical problem solving tools:        Problem solving form Process flow chart Check sheet Pareto Diagram Brainstorming Cause and effect diagram Gantt Chart

6.2 Problem solving tools application
From some common problems listed above, “Short battery life” is the most common problem has been found. Therefore, this report will consider the application of different problem solving tools in order to solve this problem. 6.2.1 Brainstorming Brainstorming is the problem solving method that can generate huge amounts of ideas as well as some creative thinking. In this process, the ideas can come from every employees of the company. Followings are some ideas of the causes of the “short battery life” problem by using brainstorming:  Too many programs are running at the same time  Background programs are running  Too much energy needed for full HD display  Customers recharge device too often  Product is used in high temperature  Searching for network signal too often  Screen brightness too high  New version of operating system needs more energy  GPS location detecting system is always running  External keyboard cannot be detected which leads to the external battery cannot be used.

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6.2.2 Check sheet All the possible causes of the problems will be plotted into a check sheet. Company needs to collect the data for those possible causes over 5 days in order to identify the occurrence frequency of the problems.
Root cause Too many programs are running simultaneously Customers recharge device too often Too many activated background programs Product is used in high temperature Searching for network signal too often Too high screen brightness Full HD display needs much energy Operation system needs much energy GPS is always running Keyboard dock cannot be detected Day 1 19 Occurrence Day 2 Day 3 Day 4 17 20 15 Total Day 5 17 88 Absolute % 35 Accumulat e% 35

16 6 2 4 3 2 0 1 0

15 6 3 1 2 1 1 1 1

14 5 3 2 2 2 1 1 0

14 6 4 4 1 2 2 0 0

16 8 5 1 2 0 0 1 1

75 31 17 12 10 7 4 4 2

30 12 7 5 4 3 2 2 1

65 78 84 89 93 96 98 99 100

Table 10 Check sheet 6.2.3 Pareto chart

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100 90 80 70 60 50 40 30 20 10 0 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0%

2012

Occurrence

Accumulative %

Figure 5 Pareto Chart From the Pareto Chart above, it is possible to state that, nearly 80% of the problem (78%) comes from free main reasons:  Too many programs are running simultaneously  Customer recharge device too often  Too many activated background programs. Therefore, the main cause of the problem is because customers use the product incorrectly that leads to exhausted battery rather than technical problems of the product. 6.2.4 Problem solving form A. Problem description Short battery life is the common problem for the electronic product. Although, the product with the external keyboard dock can run continuously without recharge over 16 hours, some customers have complained that the battery can get exhausted after using around 10 to twelve hours. This is the significant problem and the company needs to take it into account. B. Problem analysis After brainstorming process from the engineering team of the company, the “short battery life” problem can be caused by some reasons described above. From those reasons, it is possible to note that the root

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cause of this type of problem is that customers have been using the product incorrectly. C. Corrective action After determining the root cause of the problem, the customer service team need to contact the customers to describe the cause as well as provide them some corrective actions. In this case, customer service team needs to explain to customers to correct way to use the product in order to avoid this type of unexpected problem. On the other hand, it is possible to note that the customer service team needs to receive the sufficient training about the problems and the solutions so that they can serve the customers in the better way. D. Follow up On week after the corrective actions have been taken, customer service team needs to contact the customers to identify whether the problem occurs again. If the problem appears again despite customers have used to product correctly, company needs to identify the correct causes of this problem. It means that the problem solving process needs to be taken again.

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7. References
Akpolat, H. 2004, Six Sigma in Transactional and Service Environment, Gower Publishing Limited, Aldershot Barra, R. 1983, Putting Quality Circles to Work: A Practical Strategy for Boosting Productivity and Profits, McGraw-Hill, New York Cooper. R.G., Edgett. S. 2008, Ideation for Product Innovation: What Are The Best Methos?, PDMA Visions Magazine Montgomery, Douglas. 2005, Introduction to Statistical Quality Control, John Wiley & Sons, New Jersey

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