2.3.1 Defensive design

• Defensive design considerations:

• Anticipating misuse

• Authentication

• Input validation

• Maintainability:

  • Use of sub programs

  • Naming conventions

  • Indentation

  • Commenting

2.3.2 Testing

• The purpose of testing

• Types of testing:

  • Iterative

  • Final/terminal

• Identify syntax and logic errors

• Selecting and using suitable test data:

  • Normal

  • Boundary

  • Invalid

  • Erroneous

• Refining algorithms