The occupational-environmental typology (Holland, 1985) is based on a theory of persons and work environments. The theory uses a classification of persons and work environments to describe differences and similarities. The theory explains career choice and persistence, attraction and retention of workers, job satisfaction, and environmental quality. Individuals and work environments can be described by their degree of resemblance to Holland's six personality types: realistic, investigative, artistic, social, enterprising, and conventional. A secondary concept describes the resemblance of a work environment or person to one or all six types. Congruence between an environment and the workers this environment recruits should lead to a productive and well-ordered environment. Environmental classification has been used to organize information about occupations, such as in the Dictionary of Occupational Titles and the Position Classification Inventory. The typology has been applied to environments other than occupations, such as organizations, spouses, clients, and roommates. Classification in research is organized in three categories: information about career trajectories, the concomitants of person-job match, and the relationship of the classification to other systems. (Twenty figures, 9 tables, and 60 references are included.) (NLA)