This article accompanies Holding On to Your Flight Risks.

New research from PricewaterhouseCoopers shows that top-performing employees are beginning to leave organizations for better opportunities.

Among the trends cited in the executive summary of the PwC Saratoga 2011/2012 US Human Capital Effectiveness Report:

* Workforce planning will need to recognize new organization and workforce models.

* Voluntary turnover trends indicate increased demand for key workers.

* Quality of hire continues to improve, but results appear to be linked more with economic cycles than improvements in HR processes.

* Companies move to a global HR delivery model.

See the entire executive summary here.