With excerpts from my Project Management Novel, I will illustrate the many processes of the PMBOK. Here is the thirteenth one: Determine Budget. Use this map to see how this process fits into the scheme of processes.
Then Gwilym aggregated these costs to each deliverable and then to the overall project. Due to the low daily rate of the men, he saw that he would complete the project under budget. Of course, that assumed nothing went wrong. Something always did, so Gwilym had a reserve in hand.