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A classification system is a set of specified rules for describing the structure of and relations among a set of objects drawn from some domain that permits similar units to be assigned to a smaller number of categories. They identify four basic steps that are required to generate a classification:
- Specification of the domain of objects to be classified,
- definition and measurement of the essential properties of objects lying in this domain,
- appraisal of the relative similarity of these objects to each other, and
- specification of decision rules for determining when objects display sufficient similarity to permit assignment to a common category
Fleishman, E. A., & Mumford, M. D. 1991. Evaluating classifications of job behavior: A construct validation of the ability requirement scales. Personnel Psychology, 44:523-575.