This technical report documents the processes and procedures employed by NWEA® to build and support the English MAP® Reading Fluency™ assessments administered during the 2020-2021 school year. It is written for measurement professionals and administrators to help evaluate the quality of MAP Reading Fluency. The seven sections of this report: (1) presents an overview of the English MAP Reading Fluency assessment, including the rationale behind its design; (2) describes the MAP Reading Fluency test forms and provides the specifications for each measure included on the assessment; (3) explains the process for developing items for the MAP Reading Fluency assessments; (4) describes the test administration process, including setting up and managing students and test sessions; (5) summarizes the scoring and reporting processes for MAP Reading Fluency; (6) presents technical information on the measurement characteristics of the MAP Reading Fluency's Foundational Skills and Oral Reading Fluency scores, including reliability and validity evidence; and (7) describes the MAP Reading Fluency Dyslexia Screener that assesses key reading skills, including those most often associated with dyslexia, without the need for a separate assessment.