large, batch-oriented processing or embedded process control applications.
ITERATIVE DEVELOPMENT
The problems with the Waterfall Model created a demand for a new method of developing
Systems which could provide faster results, require less up-front information, and offer greater flexibility. With Iterative Development, the project is divided into small parts. This allows the development team to demonstrate results earlier on in the process and obtain valuable feedback from system users.
Often, each iteration actually a mini-Waterfall process with the feedback from one phase providing vital information for the design of the next phase. In a variation of this model, the software products which are produced at the end of each step (or series of steps) can go into production immediately as incremental releases. use of an existing system or system components to demonstrate some functions that will be included in the developed system. Prototyping is comprised of the following steps:

Requirements Definition /Collection - Similar to the Conceptualization phase of the
Waterfall Model, but not as comprehensive, the information collected is usually limited to a subset of the complete system requirements

Design - Once the initial layer of requirements information is collected, or new information is gathered, it is rapidly integrated into a new or existing design so that it may be folded into the prototype.

Prototype Creation / Modification -The information from the design is rapidly rolled into a prototype. This may mean the creation/modification of paper information, new coding, or modifications to existing coding.

Assessment - The prototype is presented to the customer for review. Comments and suggestions are collected from the customer.
Prototype Refinement - Information collected from the customer is digested and the prototype is refined. The developer revises the prototype to make it more effective and efficient. System Implementation -In most cases, the system is rewritten once requirements are understood. Sometimes, the Iterative process eventually produces a working system that can be the cornerstone for the fully functional system.

Problems/Challenges associated with the Iterative Model
While the Iterative Model addresses many of the problems associated with the Waterfall Model, it does present new challenges.
• The user community needs to be actively involved throughout the project. While this involvement is a positive for the project, it is demanding on the time of the staff and can add project delay.
• Communication and coordination skills take center stage in pr