SDM - SOFTWARE DEVELOPMENT METHOD We Need a Plan...

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We Need a Plan!
SOFTWARE DEVELOPMENT METHOD
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SOFTWARE DEVELOPMENT METHOD
1. Specify the problem requirements
2. Analyze the problem
3. Design the algorithm
4. Coding
5. Testing and verification
6. Maintenance
Also known as the Waterfall Method;
one step is dependent on the previous step.
The process of developing
a computer program to solve a specific problem:

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SOFTWARE DEVELOPMENT METHOD
Fun Example: Assemble a Swing Set
I. Problem Specification – to assemble a swingset from a kit
II. Problem Analysis
What are the inputs? The objects! The Things!
Need a kit (go buy one)
Does it have all the parts in the kit?
Screws, braces, directions, etc.
Need tools – scissors, screw driver, wrench
What is the output? The result? A swing set
III. Design – Plan for doing the work
Step 1: Major tasks refinement into more detailed subtasks
1. Assemble the individual components
Assemble the frame
Assemble the seats
Assemble the teetertooter
Assemble the slide
2. Put the components together
Step 2: Now, Convert the outline of the steps into
a detailed step-by-step list, the algorithm.
IV. Follow the detailed steps/directions
Implement the algorithm !
V. Test the swing
Is it safe? Any sharp edges?
What is the max weight?
OK kids come play!!!
Released for use
VI. Check on it occasionally – maintenance
Add a chin-up bar
Check for broken parts
Upgrade the slide, etc.

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SOFTWARE DEVELOPMENT METHOD
1. Specify the problem requirements
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Establish the level of abstraction :
Understand the problem.
What is NOT the problem?
What is essential to solve the problem?