Project Planning-Critical Path Method (CPM) Thus, activities A, B, D, E, F, G, L, M, and O are on the critical path. Upon highlighting those activities (see Figure E7.4.2(b)], we see that activity Fand the E-G segment appear to be alternate subpaths of the critical path. In fact, all three of the E, F, and G activities are critical in the sense that a delay in any one of them would cause the entire project to be delayed. 4040404040