Persons who provide research, development and analysis of data or other Information and materials based upon specifications provided by a department. Includes services by sociologists, social scientists, genealogists and archaeologists. Also, persons who conduct or perform scientific research and development through observation, study, experiments and other scientific projects; including knowledge of nature or physical phenomena. Includes chemists, biochemists, biotechnicians, biologists and biogeologists. For policy planners, use 757220. For court related investigations and research, use 761130.