This working paper provides background information for persons interested in occupational data by informing them of the work of the committee, and serves as a basis for discussion of the direction of future work in this area. The current intensive interest in occupations and occupationally classified data, and the increase in the number of agencies collecting and using such data suggest the need for a review of the occupational classifications systems presently available and of relevant procedural and compilation policies. Discussion of classification systems includes the Convertibility List of Occupations, 1940; the 1960 Census of Populations Classified Index of Occupations and Industries; The Dictionary of Occupational Titles, 1965; and The International Standard Classification of Occupations as developed by the International Labor Office. Numerous government agencies are cooperating in the development of procedures for the collection and classification of occupational data. The committee plans, as one of its long range objectives, to investigate the possibility of establishing a standard occupational classification, analogous to the Standard Industrial Classification, and to establish such a system if it appears possible. (CH)