The integration of science, technology, engineering, and mathematics (STEM) education has received increased attention in the last decade. This is in part because of the need for students to increase in their STEM knowledge and competencies. Research is still needed to determine effective implementation models and curriculum for integrated STEM. Mathematics in particular has not received the focus it deserves with STEM integration. This paper discusses integration of STEM subjects that has a focus on mathematics (integrated steM); including summarizing and analyzing research done in the last ten years. A s.t.e.m. (Support, Topics, Emphasis, and Mathematical content) model for integrated steM research is presented to guide future research.