The efficiency of development processes is based on a powerful and integrated tool support. But development processes are individual and no standard software can fulfill this integration 100%. With the Team Foundation Server API we have a powerful technology to extend the standard functionality for our needs. As an example in this session we will live code a tool to organize workitems in a hierarchical way and you will learn how this can improve your development process. Also you will get some additional visions about how you can use TFS Extensibility to make real cool things with your TFS.