The first and second generations of studies on service-learning, encompassing an era from the 1960s to the early 1990s, can be said to have consisted largely of:
1. research on experiential learning and community service in general (but not service-learning as we define it today); and
2. research conducted specifically on servicelearning programs, but having numerous methodological shortcomings.
Blyth, Dale A. and Scales, Peter C., "Third Generation of Service-Learning Research Yields More Thorough Data" (1997). Service Learning, General. 55.