Please note that my plan with this group is to work towards a standardized/converged tagging convention. The strategy for accomplishing this is roughly speaking:
Let people tag as they wish for some period of time
Analyze the tagging patterns that emerge and the define some tags that we want to use based on this
Encourage people to use these tags whenever they apply
Encourage people to continue to use any other tags that make sense to them.
Note, therefore, that this is both an exercise in collaborative research as well as an exercise in convergence on language. The latter is an aspect of the Convergence Process Project that is a part of ProM.