TfsRollUp is a C# Tfs plugin that makes it easier for Scrum Teams, et al. to see aggregated/rollup values for Remaining Work, Story Points and other units of time/effort. You'll no longer have to do the rollup manually, as TfsRollUp will calculate the rollup values when a relevant change is detected in a workitem. There is no dependency on a specific process model, the process model only needs to support parent/child relations and then you are almost ready to go.