Notes from OHR presentation on effective interviews
Post most positions for short periods. If you post "Open until filled" you may receive hundreds of applications.
Writing a good job description is the first step - lots of specifics
Write open ended, historical questions based upon job description
Ask all questions of every candidate, regardless of how good or bad they are doing (Reduces bias in your interview)
Look for evidence contrary to your first impression, whether good or bad
Data collection staff can be asked to simulate the collection process.