Among different types of norms, two of perhaps the most relevant for
linguistics are those of correctness and rationality. The aim of this
chapter is to demonstrate the relevance of both to research on
code-switching. I approach the topic from the perspective of the
philosophy of linguistics in an analysis of certain ontological and
epistemological problems in CS research, and use this analysis to draw
methodological implications for the field in general. In particular, a
methodological synthesis between intuition and observation is discussed
and illustrated with an analogy between languages and games.