A general approach to debugging Drupal problems will be presented, followed by an overview of a variety of tools such as the Devel suite, krumo, xdebug, client side debugging such as Firebug and LiveHTTPHeaders.

In addition to debugging functionality, approaches to performance related problems will be covered. Some of these techniques apply generally to all web applications or other PHP code. A structured debugging approach that narrows down problems, rather than making random changes and guesses, similar to the Scientific Method is the main goal of the talk.

The audience will have a chance to share any debugging tricks they have during a question and answer session.