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 how these data are interpreted are personal ones. Theories are not immutable laws; they are built, not on proven facts. 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.