The Cloud Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) Quid Pro Quo (QPQ) measurements in collaboration with existing sites and other activities (e.g. field programs) are an important part of the CALIPSO validation program. These sites and field programs will provide data relevant to CALIPSO validation at times when the ground-track of the CALIPSO satellite is within a specified coincident distance. A free exchange of data between CALIPSO and these sites will occur and appropriate protocols of exchange will be followed. The primary CALIPSO validation period begins approximately 45 days after launch and ends about 18 months after launch. Launch is currently planned for the spring of 2005. Coordination of the validation measurements will be made through the CALIPSO website (http://www-calipso.larc.nasa.gov), the CALIPSO QPQ validation website (http://calipsovalidation.hamptonu.edu), email, and mail. This paper describes the details of this coordination.