Robust Programs

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Data Validation does not check that data is accurate. It checks that data is sensible. For example, in range.

Data verification uses dual entry (such as a presence check or confirmation) to check that data is accurate.

Software

Maintainability, you must be able to update it once it is out. The code itself must be easily understandable, with comments and indents.

There are 2 types of tests, iterative (as you go) and terminal (aka final, at the end, designed test).

Clients provide requirements. Users maintain code. The audience uses the code.

Test Data

There are 3 types of test data; Normal, Extreme and Erroneous

Types of Errors

Runtime, no memory.

Syntax, bad grammar.

Logic, bad logic.