At the moment there are five different popular process templates, three from Microsoft official, one on Codeplex (by some Microsoft guys afaik), and one from Conchango. The fields defined in the workitemtypes found in these templates belongs to a set of namespaces. The System namespace is a predefined Microsoft namespace, with special behavior. The other ones are in reality free text. However, since some effort has been placed on defining these namespaces, and some of these fields are used in several ......