Summary of parallel session I: grid testbeds and applications

This paper is a summary of talks presented at ACAT 2002 in parallel session I on grid testbeds and applications. There were 12 presentations on this topic that show a lot of enthusiasm and hard work by many people in bringing physics applications onto the grid. There are encouraging success stories and also a clear view that the middleware has a way to go until it is as robust, reliable and complete as we would like it to be.