skills of each occupation must also be considered. They facilitate work across a variety of settings.

Knowledge is defined as a collection of discrete but related and original facts, information, and principles about a certain domain. Accordingly, types of knowledge were identified by determining basic types of concepts likely to be applied in a variety of different jobs (i.e., basic concepts involved in electronics, psychology, and transportation were considered, among other areas). In all, 33 broad knowledge areas were identified, with each area subsuming a number of more specific concepts. For example, biology might subsume cellular biology, ecology, genetics, and biochemistry.

Experience Requirements Experience requirements refer to training and career history events that influence knowledge and skill development. In contrast to skills, abilities, and knowledge, which describe the actual capabilities and competencies that an individual may bring to a job, variables in this domain either provide evidence that the person has actually performed the same or similar work previously (experience), or provide evidence that the person does or did possess the knowledge and/or skills necessary to perform the job (education, training, or licensure). Relevant work experience refers to job tenure in related jobs and training experiences in the work context, including apprenticeships, on-site training, and on-the-job training, whereas educational and licensure requirements focus on the amount and type of education or licensure required. The information in the experience domain may be used differently by various O*NET™ users. Those seeking jobs or career guidance would most likely be interested in the amount and type of education or licensure required, whereas potential employers would be most interested in evidence of competence signified by completion of a particular educational or training regimen.

Occupational Requirements Three major areas are included within the occupational requirements domain—generalized work activities, work context, and organizational context.

Generalized work activities are defined as an aggregation of



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