A set of propositions that specify the relations between observable variables is best described as a theory.
A theory is a logical explanation or analysis of one or more phenomena. Theories can take various forms, but they have one thing in common. It goes beyond the occurrence that theory explains by including variables, formations, processes, purpose, or principles of organization that are not directly observed. It is an arranged and systematic presentation of a set of statements about domain issues that are communicated as a meaningful whole. Its purpose is to describe, explain, predict and prescribe.
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