In this presentation, Tom Cook and Michael Scriven for The Evaluation Center, discuss the latest methodological developments in using randomised-control trials in educational and other settings. They also provide some more general discussion of their recent thinking regarding causation.
Sources
Cook, T., and Scriven, M., (2008), Contemporary Thinking about Causation in Education Evaluation: A Dialogue with Tom Cook and Michael Scriven, The Evaluation Center, Retrieved from: http://vimeo.com/60681423