SE2 revision pt.2

How many stages are there in SDLC (Software Development Lifecycle)

• 5

• 6

• 7

• 8

Software lifecycle models describe:

• ideal scheme

• abstracted version of reality

• overall distribution of the software construction into tasks

• the waterfall model

Re-arrange the # of stages in Software Development Lifecycle from stage 1-5

Determine the scope of the problem

Designing the solution

Gather requirements

coding & testing

Writing the specification

• Determine the scope of the problem

  Designing the solution

  Gather

  Writing the specification

  requirements

  coding & testing

• Determine the scope of the problem

  Gather requirements

  Designing the solution

  coding & testing

  Writing the specification

• Determine the scope of the problem

  Gather requirements

  Writing the specification

  Designing the solution

  coding & testing

• coding & testing

  Gather requirements

  Writing the specification

  Designing the solution

  Determine the scope of the problem

Re-arrange the # of stages in Software Development Lifecycle from stage 6-8

Testing (Continued)

Writing Documentation

Review and Maintain

• Writing Documentation

  Testing (Continued)

  Review and Maintain

• Testing (Continued)

  Writing Documentation

  Review and Maintain

• Review and Maintain

  Testing (Continued)

  Writing Documentation

What are the characteristics of internal documentation in Writing Documentation phase

• Use correct naming conventions especially when naming your variables

• Written by developers for other developers to read

• Use a tidy layout, complete with indentation and blocking correctly

• Good use of comments, describing the purpose of the bits of code

What are the characteristics of Technical Documentation in Writing Documentation phase

• Should cover: Requirements, Flow charts,...

• Often uses jargon and programming terminology, but it must also be backed up with a clear and concise explanation!

• Written by developers for other developers to read

• Use a tidy layout, complete with indentation and blocking correctly

What are the characteristics of User documentation in Writing Documentation phase

• Technical terms and jargon are avoided!

• Troubleshooting and help, examples of program working

• How to use the program and installation

• Often uses jargon and programming terminology, but it must also be backed up with a clear and concise explanation!

Software lifecycle models describe an overall distribution of the software construction into:

• parts

• phases

• tasks

• compnonents

What is the characteristic of the waterfall model?

• Apply a waterfall-like approach to successive prototypes

• Continuous, incremental development

• Succession of steps, with possibility at each step to question and update the results of the preceding step

• Reversibility: go back and forth

Problems with the waterfall?

• Lack of support for requirements change — and more generally for extendibility and reusability

• Software development is hard because of the need to reconcile conflicting criteria, e.g. portability and efficiency

• Late appearance of actual code.

• A prototype typically sacrifices some of these criteria Risk of shipping the prototype

• Lack of support for the maintenance activity (70% of software costs?)