1. 5 POINT PLAN THE SYSTEMS LIFE CYCLE ANALYSE DESIGN
IDENTIFY/INVESTIGATE
DESIGN
5 POINT PLAN
IMPLEMENT
MAINTENANCE

2. 1.Identify/Investigate problem
2.Analyse The Problem
3. Design A Solution
4.Implement Your solution
5. Maintain the solution

3. Identify/Investigate problem
1. How does the current system operate
2. What does the current system not do
3. What should the new system be able to do
4. What are some alternative solutions
5. A recommended course of action

4. If the Identification recommends that the project can go ahead:
Make out a list of Objectives/Criteria
Begin the Analysis

5. List of Objectives/Criteria
These should be kept simple and should be referred to throughout the coursework to ensure you are achieving what you set out to do eg.
The output must be easy to read and understand
Test the solution using suitable test data
Produce a template that can be re used

6. Analyse The Problem
Examine what problems exist within the current system by asking questions
What is being done now ?
Why is it being done ?
Who is doing it ?
How is it being done ?

7. Fact-finding methods used to gather information
Analyse The Problem
Fact-finding methods used to gather information
Questionnaires
Interviews
Observation
Examining Docs

8. The investigation is used to produce a detailed description of the current system including the use of
Data Flow Diagrams
and
Systems Flowcharts
See page 216 to 219 of text

9. Design A Solution Identify the alternative possible solutions
What hardware does the solution require ?
What benefits does this new solution offer ?
What are the drawbacks of this solution ?
How long will development take ?
How much will this solution cost ?

10. Design A Solution
Having identified the best solution produce a detailed design specification
Input
Back up procedures
Output
Security Procedures
Data Storage
Test Plan
User Interface

11. Set up the system so that it matches the design specification
Implement A solution
Set up the system so that it matches the design specification
Create data files
Set up the user interface
Set up validation checks
Set up system security
Enter enough data to test the system
Create input/output screens

12. Implement A solution
When testing the system use the plan prepared during the design stage
Normal data - expected during day to day use
Extreme data - data that lies at the boundaries of acceptable input
Erroneous data - data that lies outwith the boundaries

13. Implement A solution It is now possible to install the new system
Direct Implementation -
Instantaneous change from old to new system.
Quick but very disruptive if errors found
Parallel Implementation -
Run both systems simultaneously over a period.
Longer to operate. No disruption from errors
Phased Implementation -
Introduce the new system in smaller parts

14. Implement A solution
Finally, documentation must be produced for the system
Technical Documentation
User
Documentation

15. Implement A solution Technical Documentation
System Design Specification
Description of the system
Flowcharts
Screen Layouts and UI Designs
The Test Plan

16. Implement A solution User Documentation Minimum System requirements
Additional Support [Help Lines]
Loading Instructions
Meaning of Error Messages
Operating instructions

17. Some time after installation, a new system may need to be changed
Maintenance
Some time after installation, a new system may need to be changed
to satisfy the needs of the user
to correct problems
to improve the system

18. The solution to each problem must be evaluated to check it’s success
Evaluation
The solution to each problem must be evaluated to check it’s success
Is the PROBLEM solved ?
Have the Objectives/criteria been met ?
Did the test data work ?
How can the system be improved ?

19. Chapter 10 pgs
gives a detailed breakdown of the requirements to be met for your coursework projects