Postgraduate tutors have an important role to play in teaching and learning in higher education. There has been substantial research conducted in this area - much of it is orientated towards improving the quality of the methods of instruction and classroom practice. Far less research has been focused on the postgraduate tutors as producers of content. This research is based on an intervention that tasked five postgraduate tutors with planning two tutorials and designing an assessment task: activities that fell outside the scope of their usual work and roles. The aim of the research is to discover more about how postgraduate tutors, who typically have extensive and expert content knowledge, but very little pedagogical knowledge, develop pedagogical content knowledge. The study tracks the decision making process and the knowledge reservoirs that the participants emphasise in their planning and design in order learn about the teaching beliefs and priorities of these novice teachers. The analysis goes on to explore the criteria for legitimation that the postgraduate tutors establish and/ or entrench. The study finds that the participants are highly sensitive to the many kinds of constraints that circulate and that they in turn re-circulated. It goes on to suggest that postgraduate tutors are likely to reproduce the regulative rules that they find in operation and the cumulative messages of what is valued in terms of student and teacher performance in a given context.