Debuggers often frustrate me. What I prefer to do is find a point of entry (ie: Button if GUI, or command line argument, etc). I then read through the code from

Debuggers often frustrate me. What I prefer to do is find a point of entry (ie: Button if GUI, or command line argument, etc). I then read through the code from that point of entry, tracing it down to where it goes (db, disk, etc.), logging in my journal key points of interest. I do this over and over until I have a really good idea of the code. Some, things to note. I've worked on code bases that were in the 10s of millions of lines of code (healthcare industry). I still use this technique, but with the understanding I may never have a complete model of a code base that size.