Conduct qualitative and quantitative chemical analyses or experiments in laboratories for quality or process control or to develop new products or knowledge.

Investigate atmospheric phenomena and interpret meteorological data, gathered by surface and air stations, satellites, and radar to prepare reports and forecasts for public and other uses. Includes weather analysts and forecasters whose functions require the detailed knowledge of meteorology.

Conduct research into physical phenomena, develop theories on the basis of observation and experiments, and devise methods to apply physical laws and theories.

Observe, research, and interpret astronomical phenomena to increase basic knowledge or apply such information to practical problems.

Conduct research dealing with the understanding of human diseases and the improvement of human health. They engage in clinical investigation, research and development, or other related activities. Includes physicians, dentists, public health specialists, pharmacologists, and medical pathologists who primarily conduct research.

Investigate and describe the determinants and distribution of disease, disability, or health outcomes. They develop the means for prevention and control.

Plan, develop, and conduct programs to inform public of historical, natural, and scientific features of national, state, or local park.

Research or study range land management practices to provide sustained production of forage, livestock, and wildlife.

Plan or develop coordinated practices for soil erosion control, soil or water conservation, or sound land use.

Research and study the inheritance of traits at the molecular, organism or population level. They evaluate or treat patients with genetic disorders.