Design theory tends to adopt a prescriptive approach to designers’ responsibility, taking it upon itself to lay out guidelines for good conduct. However, given the impact of graphic design on human behavior and the fabric of society as a whole it seems essential to study how designers’ themselves define their responsibility. Thus, the purpose of our research is to collect, interpret and describe the meanings practitioners assemble with regard to their moral obligations. A qualitative study, built upon group interviews, has offered us a dual assessment. First, the analysis of each group allowed us to identify responsibility as a habit, in the Peircean sense of the term, that each designer establishes in relation to a network of stakes and stakeholders he or she articulates around his or practice. Secondly, the study of individual discourses revealed models of three potential perimeters of the system within which they evaluate their obligations.