Tinbergen's Four Questions

Tinbergen's four questions, named after Nikolaas Tinbergen, are complementary categories of explanations for behavior. It suggests that an integrative understanding of behavior must include both a proximate and ultimate (functional) analysis of behavior, as well as an understanding of both phylogenetic/developmental history and the operation of current mechanisms.

Read more about Tinbergen's Four Questions:  Four Categories of Questions and Explanations, Causal Relationships, Use of The Four-question Schema As "periodic Table"

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    It is one of the chief skills of the philosopher not to occupy himself with questions which do not concern him.
    Ludwig Wittgenstein (1889–1951)