[tester756]

I call it debugger-driven-development and it is indeed great when you have to get quickly into huge, complex codebases.

It allows you to learn them very fast.

VS has great debugger for C# which allows you to do a lot of stuff when running the program, so sometimes I even develop the soft while having debugger and breakpoints attached

[Stratoscope]

This is funny, that is exactly the term I use too:

https://news.ycombinator.com/item?id=29387515

Beware: you may get criticized for it as I was in that thread... :-)