Process Improvement - Where should you start?

If you are at a loss for how to improve your test process, start by rating the severity and impact of defects that escape your development and test process.  Group these escapes by product/system function, test issues (no test or scenario, the test was not run, missing data, defect found but scope/severity wrong, ...), and development/root cause issues so that you can then prioritize changes to attack.  Enjoy!