programming- System design and planning

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System design and the life cycle of systyems

Copyright: www.how-to.tk, by TheWomble
The basics of planning programming commerically
Life cycle of a system:
Feasibility->Design->Implement->Test
+ Feasability -Analysis

Technical feasability study: Can it be done with existing hardware

Economic study: Is it economically viable to implement

Legal study: Is the Data Protection act being broken?

Operational: Can everything be transferred from the old system? scratch?

Schedule: To make sure all is done on time
Analysis:

Questionaire

Observe working practices/ Systems

Interview key people

Data Flow Diagrams

+Design

Prototyping: Testing a part/whole of the system

Throw away: A very quick test to show the user it can be done/ what needs to be changed

Evolutionary: When the prototype is used

Normally prototypes are not thrown away

Implementation
Test:

After it has been finished, someone else can test it

Alpha and Beta testing, where it is given to part of the users

Maintenance:

Where errors which appear are fixed (service packs) -Corrective maintenance

Perfective maintenance: Increase speed etc.

Adaptive: When requirements change slightly, eg. Increase size of database

Give the user documentation- User manual and System maintenance

Support -Helpline

Training



Notes:
Prototyping is producing simple programs
To test to see if an idea is feasible, or to allow the client to input on what must be done.
One method of testing is where errorneous data is intentionally entered to test the program to its limits. Another is giving the program to someone outside of the programming team, possibly the user, to test it.

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