Welcome to the Virginia Longitudinal Data System (VLDS) , a multi-agency collaborative effort to securely link data across agencies for longitudinal studies. The VLDS offers longitudinal data analysis of education and workforce data from multiple partner agencies and is extensible to include other agencies in the future. In addition to existing Longitudinal and Agency Reports, the VLDS offers researchers the ability to build custom data sets through access to a specialized VLDS Lexicon and Query Building Tool.