A construction company planned for a new project and represented the tasks of the project as a list of immediate predecessors, estimated duration (best, most likely, worst) as follows: Activity Estimated duration (best-most likely-worst) in weeks A D E H F G B I J K C M N End immediate predecessors A D E A F B 1 J C M N H,G,K,O 2-4-6 6-8-10 7-9-12 2-3-5 3-4-8 5-7-9 2-2-3 2-3-6 3-4-5 4-5-8 5-8-12 1-1-1 6-7-11 8-9-13