The critical path has been identified, which is ABDE. The forward and backward pass and activity slack has been computed, which results in the project taking $14$ days.

$7.$ The project information for the custom order project of the Air Control Company is presented here. Draw a project network for this project. Compute the early and late activity times and slack times. Identify the critical path.

ID Description Predecessor Time

A$.$ Order review $$None $2$

B Order standard parts A $3$

C Produce standard parts A $10$

D Design custom parts A $13$

E Software development A $18$

F Manufacture custom hardware $$ C$,$ D $15$

G Assemble $$ B$,$ F $10$

H Test $$ E$,$ G $5$