Fares Aboushnaf Action research is about changing and improving through participation. One possible key question is: How can I/we improve what we are doing (Whitehead and McNiff 2006 from the book "Doing and writing action research"). The aim can empowerment. Olav Eikeland (2008) has written an excellent book on the topic in "The Ways of Aristotle".
Case study is an in-depth investigation of a particular case (i.e., an individual, a community, a country, etc.). Case studies are important ,but the results they provide lack generalization. Action research, on the other hand, is the arena whereby the researcher, who is usually a teacher, uses certain data collection tools in order to collect, analyze, and interpret the targeted data to generate a pattern. Case studies are data driven and end with the generation of a given hypothesis; however, action research can be both exploratory and/or confirmatory making it possible to either test an already existing hypothesis or generate a new one.
Case study should not seek to generate hypotheses but semiotic questions. These questions should provide insight on new complex phenomena. So, while case study may inform the generation of new hypotheses, that should not be the objective. Remember, we resort to case study when we cannot use the hypothetico-deductive approach because the focal phenomena are too complex. Cf. Article Public-Private Partnerships (PPP) on Moulding State Structur...
I am just curious, if we refer to action research as to an action (or an intervention) that is intended to collect and generate data (Holian and Coghlan; in Saunders and Tosey, 2015), can it be viewed as an approach used by a researcher doing case study? E.g. we have several cases each involving some type of intervention as part of action research
let me have an example, in teaching and learning, action research is used to solve the problem that a teacher confronts, the collecting data and suggesting a strategy and implement of it and finally measure the impact of that strategy to see whether the problem is solved, this chain is continued until the problem is solved, however, in case study you will not in this manner (see the recent paper of Prof. Jones as mentioned above).
In teaching and learning, case study is not necessarily a problem of teacher.
Although both are qualitative method under qualitative research approaches, Action research are under design research.
Besides differences in methodology, sampling in case study is different from Action Research.
I recommend to find some articles which methodology are case study and action research as well, the compare what are the same and what are the differences and share your findings to us.