The Charleston Comprehensive Literacy Initiative (CCLI) is comprised of Charleston County School District (CCSD) working the University of Florida Lastinger Center (UFLC) to launch a series of tailored literacy professional development initiatives. This proposal is focused on the CCLI efforts during the 2019-20 school year. UFLC is partnering with FPG to conduct an evaluation of the effectiveness of the CCLI, especially as related to the Matrix Online Professional Development (MOPD) implementation in 2019-20. The FPG evaluation team will evaluate teacher-level and student-level growth over the course of the 2019-20 school year in an effort to determine efficacy of the MOPD.