... He then broke down the field into two parts, the observable phenomenon (i.e. behaviour or movement), and more radically the method of study. Due to the complexity of the subject this was further broken down into different questions that should be addressed based on the previous work of HUXLEY. His work was on the "three aspects of biological fact"; "Every biological fact can be considered under three distinct aspects. First, there is the mechanical-physiological aspect: what is the functional use of the organ or process, what is the biological meaning or value to the organism on question? And in third place, there is a historical aspect: what is the temporal history of the organ or process, what has been it's evolutionary cause." Huxley's work established a procedure or rather a general scientific method for approaching the biological study of an organism. TINBERGEN used these three aspects, causation, survival value and evolution and ...

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