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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    Science asks no questions about the ontological pedigree or a priori character of a theory, but is content to judge it by its performance; and it is thus that a knowledge of nature, having all the certainty which the senses are competent to inspire, has been attained—a knowledge which maintains a strict neutrality toward all philosophical systems and concerns itself not with the genesis or a priori grounds of ideas.
    Chauncey Wright (1830–1875)