Answer: His way of thinking closely resembles FUNCTIONALISM.
Explanation: Functionalism in Social science can be defined as the idea that social and cultural cohesion are a function of the interdependence and interactions of the institutions of a society.
This is essence what Pierre thinks about. Thinking of institutions and human activities ( social and cultural cohesion) by analysing relationship of each individual part as it relates to the whole (a function of the interdependence and interactions of the institutions of a society) .