No one doubts the potential value of volunteers; the tougher issue is getting the most out of them. Unfortunately, volunteers are both scarce and much-needed in the human service field. This report summarizes P/PV's work over the years with organizations that use volunteers. The analysis discovered that three functions -- screening, training and ongoing management -- are key to maximizing volunteer value and minimizing damage. The report also links those functions quantitatively to the impact that programs achieved, and estimates their cost.