Code of Federal Regulations Title 5. Administrative Personnel § 5.9701.211 Occupational clusters

For the purpose of classifying positions, DHS may, after coordination with OPM, establish occupational clusters based on factors such as mission or function;  nature of work;  qualifications or competencies;  career or pay progression patterns;  relevant labor-market features;  and other characteristics of those occupations or positions. DHS must document in implementing directives the criteria and rationale for grouping occupations or positions into occupational clusters.