In January 2023, the I3 Center launched the Data Research Learning Network (DRLN) to support districts and counties in innovating their data and assessment practices. In Phase 1 (Planning), seven select districts and county offices of education conducted deep data dives to identify challenge areas; generate problems of practice that are measurable, achievable, and relevant; and develop innovative action plans. This brief provides an overview of the lessons learned that emerged from the collaborative work of the DRLN throughout the six-month Planning Phase.