producing robust programs

producing robust programs

1. creating hard to break programs

2. defensive design

   • protection against unexpected user inputs
     • validation
       • sensible and reasonable
         • name
           • right data types
         • DOB
           • DD/MM/YYYY
   • maintainability
     • comments
     • indentation
     • formatting
       • subroutines
     • reduce the chance of introducing coding mistakes/bugs
     • naming conventions
   • minimising/removing bugs
     • testing
       • program functions as it was designed
       • meets the need of the end user
       • iterative testing
         • test while developing, repeating
       • final testing
         • at the end when the program is finished
       • test plan
         • valid
         • invalid
         • borderline
   • authentication
     • having usernames+passwords