What notion of action is compatible with constructionist research? Taking this question as a provocation, we use a study carried out to evaluate the role of the National Aids Committee (CNAIDS) of the Brazilian Ministry of Health as a starting point for the formulation of a concept of action that might be compatible with a constructionist position. Starting by questioning the classic notion of action, it goes on to propose alternative conceptualisations of action, exploring the implications of notions such as Varela?s enaction for constructionist research.