1. Learning Intention
I will learn about the iterative software development process with a focus on the Analysis stage.

2. Iterative Development Process
Software Development (making computer programs) is a six step process:
Analysis
Design
Implementation
Testing
Documentation
Evaluation

3. Iterative Development Process
Iterative means ‘to do over again’.
Software development process is iterative as each stage may need revisited as new information comes to light.

4. Police Scotland i6 IT Project
F A I L E D
No agreement over what was needed between Police Scotland and the company making the program.
No ability to test until very late on.
£24 million refunded

5. BBC Digital Media Initiative (DMI)
F A I L E D
“confusion and a lack of planning”
No understanding of the problems being encountered
£98 million wasted

6. Analysis
Design
Implementation
Testing
Documentation
Evaluation

7. Analysis
Before you can create or even design software you need to be able to understand what is being asked for.
This stage is called Analysis

8. Analysis for a given problem description
Deciding what the software must do
Documented in the Software Specification
Need to be able to identify the:
Inputs
Processes
Outputs
for a given problem description

9. Analysis
Input -> Process -> Output is called the sequence of instructions
Input – data flowing into the system
Processing – doing something with the input
Output – data flowing out of the system

10. Input, Process, Output
Washing dirty clothes
Process
Output
Input

11. Input, Process, Output
Frying an egg
Process
Output
Input

12. Analysis
E.g. What are the inputs, processing and output for a program to calculate the area of a square?
Input:
Processing:
Output:
length of a side
area = length x length
area

13. Analysis Tasks
Complete the Analysis Stage worksheet:

14. Success Criteria
I can identify the purpose and functional requirements of a problem.