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SAD/U1 Topic 4 System Development Life Cycle

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Stage

Key Question

Result

1. Recognition of need

Preliminary survey/

Initial investigation

What is the problem or opportunity? Statement of scope and

objectives

Performance criteria

2. Feasibility Study

Evaluation of existing

system and procedures

Analysis of alternative

candidate systems

Cost estimates

What are the user’s demonstrable needs?

Is the problem worth solving?

How can the problem be redefined?

Technical / behavioral

feasibility

Cost / benefit analysis

System scope and objectives

Statement f new scope and

Objectives

3. Analysis Detailed evaluation of present system Data collection What must be done to solve the problem?

What are the facts?

Logical model of system

e.g. data dictionary, data flow diagrams Pertinent data

Design

General design

specifications

Detailed design

specifications

Output, Input, Files

Procedures

Program construction

Testing

Unit Testing

Combined module

Testing

User acceptance

Testing

In general, how must the problem be solved?

Specifically, how must the problem be solved?

What is the system (processing) flow?

Does the user approve the system?

How well do individual

programs / modules test out? How ready are

programs for acceptance test?

Design of alternative

solutions

Final cost/ benefit analysis

Hardware specifications

Cost estimates

Implementation

specifications

Implementation schedule

Approval of systems by user

Programs, Test plans

Security, audit and operating

procedures

Actual hardware use

Formal system test

5. Implementation

User training

File / system

Conversion

What is the actual

operation? Are user

manuals ready? Are

these delays in loading

files?

Training program

User-friendly documentation

6. Post-implementation

and maintenance

Evaluation

Maintenance

Enhancements

Is the key system

running? Should the

system be modified?

 

User requirements met

User standards met

Satisfied user

 

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