Producing Robust Programs

Producing Robust Programs

1. Defensive Design

   • Protection against unexpected user inputs
     • Validation
       • Type check
       • Length check
       • Format check
       • Range check
       • Presence check
   • Maintainability
     • Reducing the chance of introducing coding mistakes/bugs
       • Comments
       • Indentation
       • Formatting
         • Subroutines
       • Naming Conventions
   • Minimising/removing bugs
     • Testing
       • Iterative
         • Repeatedly testing whilst coding
       • Final
         • Testing after finishing
       • Testing Table
         • Valid Data
         • Invalid Data
         • Borderline Data
   • Authentication
     • Usernames
     • Passwords
     • Access Rights
     • Limit login attempts