Defensive Design - Crossword

Clues

1. Approach to writing programs so they cope with unexpected behaviour and stay easy to maintain. (15)
2. Considering how people might behave in ways a program was not designed for. (6)
3. Confirming a user is who they claim to be before giving access to a program. (14)
4. Checking that data entered is sensible and follows rules before the program uses it. (15)
5. How easy a program is to read, understand, fix and update. (15)
6. Using separate procedures or functions to break up a large piece of code. (11)
7. Using spaces at the start of lines to show which lines are inside a block. (11)
8. Adding notes to code to explain what it does, ignored by the translator. (10)
9. Describes a program that keeps working correctly whatever users do. (6)
10. Shown to the user when invalid data is entered, telling them what to do. (12)