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Recruiting has historically been 100% reactive in that it only acts when a requisition is opened. In a fast-changing world, that results in many missed opportunities because the best candidates are not looking at the same time that you have an opening. We are already seeing a gradual shift toward a proactive “pre-need” model where talent is continually recruited and recruiters alert managers about current talent “opportunities” even when no requisition is open.*

Source: Strategic Recruiting Issues and Trends — Fire Away with Kevin, Lou, and John by Dr. John Sullivan Feb 14, 2011, 5:46 am ET