Activity Description Predecessors Estimated Duration (days) A Design prototype drone None 5 B Build drone prototype A 20 Establish market need 10 Sign up customers C 10 Product Launch D 10 Specifications for drone B 10 Source material B 15 Build drone F. G 30 Quality check 10 Deliver drone E, I 10 Calculate the Early Start (ES), Early Finish (EF), Late Start (LS), Late Finish (LF) and Slack for Activities E, F and G. Activity E ES: EF: LS: LF: Slack: Activity F ES: EF: LS: LF: Slack: Activity G ES: EF: LS: LF. Slack