Previously science, mathematics, engineering, and technology (SMET), is a broad term used to group together these academic disciplines. This term is typically used when addressing education policy and curriculum choices in schools to improve competitiveness in science and technology development. It has implications for workforce development, national security concerns, and immigration policy. 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 science such as 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, and Social Sciences. Psychology however is considered a major part of STEM, besides the other 2 subjects. In the modern countries 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.