An online trading company is facing stiff competition and has decided to install a new computer system to allow faster and more efficient processing of customer orders, customer enquiries and the company's dealings with suppliers. The activities that will be necessary to install the new system and have it routinely operating as intended are listed in the table below.

Estimates of durations Activity ID Follows (weeks) Shortest Most likely Longest Install equipment A 6 9 12 Develop system B -= 3 7 11 Recruit new staff C 2 5 8 Test equipment D A 2 6 10 Test logic of system E B 4 7 Induction of new staff F C 2 4 6 Introduce to senior staff G C 2 3 Training on new A, E, system H F 5 7 CO A, E, Check for errors F 2 5 8 Final debugging J D 2 3 4 Trial runs K G, I 3 OO 13