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Is it possible that actual disciplinary boundaries are some kind of a combination of the three? If that is so, then how are the definition of a discipline, its description and its prescription interrelated? The task is to clarify the exact nature of disciplinary boundaries.  In addition, how are topics of disciplines related to disciplinary boundaries? Different disciplines are interested in different topics and it seems likely that there is a substantial link between the topics covered by a discipline and the boundaries of the discipline. However, it is possible for different disciplines to study the same topic. For instance, behavioural economics can study behaviours in different settings which is also a topic studied by psychology. Thus, it seems likely that there is more to disciplinary boundaries and different topics.