producing robust programs

producing robust programs

1. defensive design

   • protection against unexpected user inputs
     • validation
       • ensure data entered is sensible and reasonable
       • type check
       • length check
       • format check
       • range check
       • presence check
   • maintainabilitity
     • commenting
     • indentation
     • formatting
     • reducing the chance of mistakes/bugs
     • naming conventions
   • minimising/removing bugs
     • testing
       • makes sure that program functions as it was designed and meets the needs of the end user
       • iterative testing
       • final testing
       • valid data
       • invalid data
       • borderline
   • authentication
     • username
     • password
       • update regulary
       • complex
     • access rights
     • limit login attempts