It has implications for workforce development, national security concerns and immigration policy.[2] The science in STEM typically refers to two out of the three major branches of science: natural sciences, including biology, physics, and chemistry, and formal sciences, of which mathematics is an example, along with logic and statistics; the third major branch of science, social sciences, including psychology, sociology, and political science, are categorized separately from the other two branches of science, and are instead grouped together with humanities and arts to form another counterpart acronym named HASS - Humanities, Arts, and Social Sciences.[3] In the United States education system, in elementary, middle, and high schools, the term science refers primarily to the natural sciences, with mathematics being a standalone subject, and the social sciences are combined with the humanities under the umbrella term social studies.