If theories of personality are truly scientific, why do we have so many different ones? Alternate theories exist because the very nature of a theory allows the theorist to make speculations from a particular point of view. Theorists must be as objective as possible when gathering data, but their decisions as to what data are collected and how these data are interpreted are personal ones. Theories are not immutable laws; they are built, not on proven facts, but on assumptions that are subject to individual interpretation.
All theories are a reflection of their authors' personal backgrounds, childhood experiences, philosophy of life, interpersonal relationships, and unique manner of looking at the world. Because observations are colored by the individual observer's frame of reference, it follows that there may be many diverse theories. Nevertheless, divergent theories can be useful. The usefulness of a theory does not depend on its commonsense value or on its agreement with other theories; rather it depends on its ability to generate research and to explain research data and other observations.
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