Producing robust programs

Producing robust programs

1. Defensive desgin

   • Protection against unexpected user inputs
   • mainatinability
     • comments
     • formating
       • subroutines
     • indentation
     • naming conventions
   • Validation
     • type check
       • check if it is the correct data type
     • length check
       • check if it is the right length
     • format check
       • check if it is a certain pattern
     • range check
       • check if the number is between the two limts
     • presence check
       • check if it hasn't been left blank
   • Testing
     • Iterative Testing
       • Testing going on through the development
     • Final Testing
       • At the end of development when the program is complete it is tested again

2. Authentication

   • Usernames/passwords
     • Updating passwords
     • Limit login attempts
     • complex passwords