The product of collaboration between United Nations Volunteers and INDEPENDENT SECTOR. Researchers and practitioners from ten countries pooled their expertise to produce this toolkit on measuring volunteering. The publication aims to raise awareness of the importance of volunteering, and assist in undertaking measurement studies on national, regional, and local volunteering.
http://www.unv.org/en/news-resources/resources/on-volunteerism/doc/measuring-volunteering-toolkit.html