The article describes supervisors’ experiences of attempting to improve quality in studentteaching by focusing attention on their own expertise. We discuss if and how practicalknowledge can be formulated and present the three methods – Delphi method, stimulatedrecall and dialogue seminars – used in a design experiment to develop the supervisors’capability to, individually as well as collectively, identify and articulate such knowledge.The central question is if the ability to direct attention to the practical and tacit partsof teachers’ expertise increases the quality of the supervision and the assessment of theteacher student skills or not. The results indicate that the supervisors experience that theirpractical sight has been sharpened and that their standards have been raised.