This section is worth 25 marks. The following description is taken directly from the specification which can be located here:

Remember to apply the programming techniques and computational thinking from paper 2 into your coursework

Page 14 | A-Level Computer Science OCR Specification

Unit 3.3.1 – Iterative Development Process:

• (a) Provide annotated evidence of each stage of
  the iterative development process justifying any
  decision made.
  (b) Provide annotated evidence of prototype solutions
  justifying any decision made

Unit 3.3.2 – Testing To Inform Development:

• (a) Provide annotated evidence for testing at each
  stage justifying the reason for the test.
  (b) Provide annotated evidence of any remedial actions
  taken justifying the decision made.

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