1. Test Driven Development
Tests as goal posts

2. TDD Test Driven Development : using tests to guide coding
To add a new feature:
Write a test that will use the new feature
Write code to pass the test

3. Building a Class TDD way to build a class: Come up with basic spec
Write .h
Make .cpp with simplest constructor and accessor functions
Repeat until no more functions left
Pick a function (constructors first!)
Write a test
Run Test
Write function
While test fails, repeat c-e

4. TDD Granularity
Can use TDD at multiple levels