If our worldview of the fundamental nature of reality is that human behaviour is not nearly as complex as it actually is then our assumptions will fail to address adequately the problem at hand and we will always approach problems in a way that is too simplistic.
Given a complex problem, social scientists will divide it up into distinct pieces to be investigated by anthropologists, economists, historians, political scientists, psychologists and sociologists, none of whom communicate their findings to the others despite the scientific ideal of open communication. A simplistic metaphysical assumption or worldview of human behaviour will trump the scientific ideal of openness to the full range of phenomena relevant to the given problem. The lack of integrated understanding of human behaviour is far worse than most of us imagine and leaves us relatively helpless in the face of threatening problems such as terrorism. - The Invisible Crisis
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Neither the life of an individual nor the history of a society can be understood without understanding both.
This requires an act of imagination that is "the vivid awareness of the relationship between personal experience and the wider society".
- C. Wright Mills