Developing Excellence in Education through Professional Learning Communities (DEEP Learning Communities) is a Mathematics and Science Partnership project funded by the Mississippi Department of Education.  DEEP Learning Communities aims to meet teachers where they are in their communities to develop cohorts of effective mathematics instructors. In order to be effective, these teachers must foster a classroom environment in which students are engaged in developing a deep understanding of mathematics concepts, making sense of problems, constructing viable arguments, and making use of the structure of mathematics.