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Program Design

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1. What is System? * A set of interrelated components that function together in a meaningful way. * Often refers to the operating system, the master control program that runs the computer.

2. What is System development life cycle (SDLC)? * A set of steps for solving information system problems; the basis for most systems analysis and design methodologies. * is a process of creating or altering information systems, and the models and methodologies that people use to develop these systems.

3. What are the 8 stages in SDLC? 1. System Investigation * Feasibility study determines the probability of success of proposed system’s development project. Includes … * Technical feasibility (will we be able to build the system?) * Economic feasibility (how much will it cost to build the system and how much will it benefit us?) * Behavioral feasibility (if we build the system, will it be accepted and used?) 2. Systems Analysis * Examines the business problem(s) that the organization plans to solve with information systems * Determines what the new system must do by examining: * Strengths and weaknesses of the existing system * Functions that the new systems must have to solve the business problem(s) * User information requirements for the new system * Develops initial working relationship with current end users

3. Systems Design * Describes how the system will fulfill the user requirements * Develop both logical design and physical design * Output => technical design or system specification… * system outputs, inputs, and user interfaces * hardware, software, databases, telecommunications, personnel, and procedures * how these components are integrated * Factors to consider during make-or-buy decision * On-time/On-budget * Full functionality * User acceptance

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