In commenting on the OGSA Glossary v1.6 (6-Dec-2007), Donal Fellows said:

The definitions of EPS and CSG are at variance with what the OGSA-RSS-WG has interpreted them to mean. Of particular 
importance is the fact that we have identified the requirement for an abstract notion of a set of candidates for some 
particular activity or interaction, independent of whether that activity relates to execution management (and which is 
what we named a CSG). We then made an EPS into a profile of a CSG such that it is useful for execution management.

This comment needs to be considered w.r.t. the OGSA Architecture document, and the Glossary should be updated at that 
time to reflect any changes.