This report describes the major activities and accomplishments of Mathematica's cross-site evaluation from October 2017-September 2018. The report includes (1) a brief history of the RPG cohorts; (2) information on the RPG4 projects; (3) Mathematica's major activities for Year 1 of the contract (designing the cross-site evaluation, preparing for data collection, conducting evaluability assessments, and providing evaluation technical assistance to RPG projects); (4) a description of next steps for the second year of the contract and beyond.