This article focuses on action research and quantum physics. It proposes a comparison of the concept of reality in each frame of reference, explaining similarities related with the representational nature of reality and the observer effect. Furthermore, the researcher should choose be- tween different frames of reference, since the whole of reality cannot be explained with one single theoretical and methodological apparatus. In both action research and quantum physics the traditional construct of modern science is undermined, but there are also relevant differences: action research particularities run deeper, reality is social and is viewed as the object of improvement.