Sign up
Please tick the below box to proceed
I agree (or if I am under 13 my parent or guardian agrees on my behalf) to the terms and conditions of use and that:
- My test statistics may be published on the site leaderboard against my username
- My teacher(s) can review my test scores
- I can receive feedback on my tests from my teacher(s)
Please tick this box to proceed
Already have an account? Sign in
Preview lessons, content and tests
Computer Science & Programming solved. All in one platform.
1. To trial the platform and take tests, please take a few seconds to SIGN UP
and SET UP FREE.
2. Searching for something specific? See our text overview of all tests. Includes 'real teacher' use videos.
Defensive Design Techniques
The purpose of defensive design is make sure, as far as possible, that a program runs correctly and continues to run no matter what actions a user takes. Planning for all possibilities (contingencies) is important as well as thinking about what a user may do that the program does not expect.
Defensive design encompasses three areas:
- protection against unexpected user inputs or actions, such as a user entering a letter where a number was expected
- maintainability - ensuring code is readable and understandable
- minimising/removing bugs
This anticipation and protection is done through:
validationsanitisationauthenticationmaintenancetesting