Activity	Description	Predecessors	Duration
A	Identify product requirements for the global market	---	16
B	Preliminary design of the product	A	7
C	Select fabrication plant in another country	---	15
D	Evaluation of design	B, C	??
E	Prepare the contract with the supplier and the fabrication plant	A	12
F	Contract negotiation	E	15
G	Preparation of fabrication plant	D, E	17
H	Final design of the product	F	10
I	Fabrication of product	G	14
J	Testing of plant and product	G, H	3
K	Oversea shipment of product to owner	J, I	13

• Estimate the duration of activity D using the PERT method, knowing that it has an optimistic time estimate of 11 days, a most likely estimate of 14 days, and a pessimistic estimate of 23 days.
• Draw a Network Diagram of this project (you can use drawings tool in Word or scan in your hand drawings as an image)
• Find the critical path and the shortest time to complete this project
• Calculate the ES, LS, EF, LF, and Slack time for each task in the network (you can enter such information into the boxes of tasks on the network diagram)