Four Types of Candidates
1. Active candidates:
Usually the unemployed. It's hard to find the best in this group.
2. Semi-active candidates:
The under-employed. They have jobs but want something better. They look for new jobs on an irregular basis, usually when things get tough at work. There are some great people in this group.
3. Semi-passive candidates:
Top-notch people who have pretty good jobs, but feel the pressure of downsizing. They hope some recruiter will call with something better. You find these candidates by proactive networking.
4. Passive candidates:
They have very good jobs and have to be lured away. The cost to attract this person is too high and not worth it if you can find someone equally good using an easier sourcing technique.
via Lou Adler