DiffDebugging
Martin Fowler is one of my favourite technical authors. Recently he wrote a bliki entry titled DiffDebugging. I got the same sense of deja vu with this piece as a I did when first reading the Design Patterns classic. There's a certain satisfaction in finding out that the process or concept that you learned on the job purely by experience or need, is defined as a pattern or identified as a useful approach by experts in your industry. DiffDebugging is certainly a developer workflow pattern I've been using for a number of years. It allows the problem space to be broken down into manageable chunks so you only have to conceptually deal with the changes that have occurred as opposed to the entirety of a set of source code.