"Action research" or "research in practice" is one of the methods of quality research. In this approach, the researcher along with those who demand for a change or advance come to characterize the problem or issue and collects precise data in order to solve the problem and to change it. They then proceed to take due measures and to assess the outcomes of those measures. In order to review the backgrounds of topics of research and to discover new relations from among many preceding researches, researchers in humanities follow the so-called "meta-analysis" method. "meta-analysis" is said to statistical technics whose aim is to equalize the outcomes of independent researches. Through this method, one is able to combine the outcomes of different researches and to discover novel relation among social phenomena and provide for the precise and scientific applications of the findings. Accordingly in this paper, the method developed is first to propose the background of "action research" and then the definition and explanation of its position among other methods. They then proceed to study the competence and limitations of such method in comparison to other methods, the process and circles of "action research", its domain and aims through the meta-analysis approach.