You’re about to add a feature, but it looks difficult to do. You need to fix a bug, but you don’t understand the code. You’re doing a code review and you have a suggestion. What do you do? Refactor!

For test-driven development, integrated development environments like Eclipse provide shortcuts for use of tools like JUnit.

Many Agile practices are “updating the map.” As when driving, make frequent small corrections; adapt rather than predict.

“On the Effectiveness of Test-First Approach to Programming” concludes that test-first development, because it encourages greater testing, leads to higher productivity and more consistent quality.