Modelling is an engineering activity commonly used by engineers, and can be used also in engineering education research (EER). The use of qualitative research methods have in EER not always been widely accepted but have recently gained more attention (Case & Light, 2011). There are, however, also qualitative research methods in engineering research that may be used in EER (Bernhard, in press). One such approach is design science research, where the object of research is the design process, i.e. the knowledge retrieved is not always knowledge about the phenomenon, the artefact, the design, but rather knowledge about the method used. This paper aims at researching the method used when deriving the model “the learning of a complex concept”, the LCC-model, which we developed while designing teaching sequences in a course in electrical engineering.