Hi: Re: fig 7-8, P213, PMBOK 5.

I thought I understood how the project costs roll up from activites, to WBS, contingency reserves to come up with the Cost Baseline.

My expectation is that the sum of the activity costs is equal to the sum of the WBS components as my understanding is that the activity costs are just a further decomposition of the WBS.

However per Fig 7-8 P213 in PMBOK 5 this is not the case.