Planning for the sustainability of data system integration should be a fundamental part of the initial project plan. Taking a long-term view rather than a project-to-project approach improves the data culture and chances of success. The intent of this tip sheet is to identify key components, strategic timing, and planning considerations for sustaining data integration work. This tip sheet describes sustainability planning by the following themes, Documentation, Communication and Scheduling, Leadership Engagement, and Fiscal. The themes are intended to help users step back and think broadly and strategically rather than in a series of sequential steps. In order to help apply that thinking and manage the project and planning, CIID Data Integration Toolkit steps are listed throughout for reference. The Toolkit can also be used as a progress check to ensure that attention is paid to best practices for project sustainability. [The Center for the Integration of IDEA Data (CIID) is one of the centers in the Technical Assistance and Dissemination Network (TA&D Network) funded by the Office of Special Education Programs (OSEP).]