REDCap is a secure, web-based application for building and managing online databases. It is designed exclusively to support data capture for clinical research and trials. Redcap Data Service mainly aims at integrating REDCap with caGrid making it grid enabled so that the user can query REDCap using the Common/caGrid Query Language. This makes the service available over the grid so other services can easily query REDCap for aggregated data using a federated query processor. This helps users to collaborate and share information over the grid.