March 18, 2025 Or: why test-first development is not the same as test-driven development A while back I argued on the Blue Site1 that "test-first development" (TFD) was different than "test-driven development" (TDD). The former is "write tests before you write code", the latter is a paradigm, culture, and collection of norms that's based on TFD. More broadly, TFD is a special case of Verification-First Development and TDD is not. VFD: before writing code, put in place some means of verifying tha...