The overall aim of the Effective Implementation Cohort (EIC) investment is to increase district capacity to implement a high-quality middle years math curriculum as part of a Coherent Instructional System (CIS) to accelerate learning for students who are experiencing poverty, Black, Latino/a, and/or English Learner (EL)-Designated ("priority students"). As a Learning Partner, NIRN seeks to support partnerships between Providers and Local Education Agencies (LEAs) in their implementation and measurement efforts, as well as to collect and study data to answer the investment's learning questions within the cohort wide learning agenda. Implementation support activities and data collection, analysis, and reporting activities for the cohort wide learning agenda will be guided by the Cohort's learning questions and theory of action grounded in implementation science.