Terrence Parr, in an article for IBM developerWorks, has written an excellent introduction to debugging. It might be too introductory for some, but it covers basic points that are always good to remember.

In this article, walk through a sample problem-solving session to learn the art of debugging and highlight six essential elements of the debugging process.

Of course, he didn’t include one of my favorite debugging techniques: step away. Changing tasks temporarily or physically walking away usually gives me the fresh perspective needed to debug problematic code.