Please read the "How Exit Interviews Can Help Charities Improve Conditions for Their Remaining Employees" article in the Chronicle of Philanthropy website for the answer to this question.
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Visit Engaging Volunteers for "6 Ways Nonprofits Can Prevent Volunteer Burnout".
Read about "What Your Volunteers Need to Be Happy" on The Balance - Small Business.
The Chron article "Performance Evaluation of Volunteers" is a great resource for evaluating volunteers.