It is suggested that the usual research approach and mathematical formulation is inadequate for explanatory research. The essence of explanation as opposed to description is considered in greater depth, explanation being defined in terms of "manipulative causality".
In: Praktijk en model in de vervoersplanning : Colloquium Vervoersplanologisch Speurwerk CVS 1975: verslag van een bijeenkomst gehouden te Den Haag op 20 en 21 februari 1975, p. 341-438, 2 ref.
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