I like the question. What I offer here is my perspective after 50+ years of doing research on campus and in communities, schools, families, clinics, etc. In my view, a case study is a case of "something." An person, situation, process for which there is some consensus that it represents, is an exemplar, etc. For example, my colleague Roland Tharp and I did a case study of a man who was named in 2000 the greatest US college coach of 20th century. There was wide consensus that he represented an exemplar of an outstanding coach. One can try to imagine finding a consensus for a case study of an outstanding scientist, teacher, physician, actor, business person, leader, etc. Case studies are often compelling because they are a narrative, a story. Narratives/stories are in the opinion of many evolutionary psychologists a default form of storing, understanding, and recalling events, people, experiences. I've heard that cases are stories that exploit the "unreasonable power of anecdotes" which so often prove a barrier to persuading our brothers and sisters that what they believe may not be supported by scientific evidence. Action Research is one of those umbrella terms that has come to reference many different approaches. There's the original version that was developed in the 60s, but since then it has metastasized into myriad versions. For me action research is more or less the same as design experiments, or what Roland and I called Seral Research. Tharp, R. G. & Gallimore, R. (1982). Inquiry processes in program development. Journal of Community Psychology, l0, l03-ll8. But no matter what you call it, action research means, for example, you study yourself or other as they attempt achieve a change in behavior — for example trying out some ways to improve the delivery of instruction, coaching, counseling, medical service, or whatever form of intervention is attempted. Roland and I describe in the 1982 article a series of "research moves" we took to improve the reading of young Native Hawai'ian students. We tried this, and then that, and this, and then that, and all the time we were collecting data, making adjustments based on the data, and slowly but surely refining our intervention. I hope this helps. You can also reach me by email. [email protected] Best regards, Ron
I think the key to action research is the goal of changing something. So, for something to be action research, you need to try to bring about some outcome that you or others consider to be desirable
An another distinction I have seen in the educational sphere is that teachers are frequently engaged in action research of their own practice. Often the results are not intended for publication but for improved pedagogy.
Action research is a research that directs a quick solution to a field problem. As for the case study, it is linked to a deep study of a specific case from all sides.