Problem: An important client of RoboTech has asked for a redesign and redevelopment of one of RoboTech's industrial robots. The client wants to see a demonstration, a technical proposal and a cost proposal as soon as possible. The project team at RoboTech has identified the tasks involved as indicated in the table below. The activities and their predecessors are listed as follows:
Activity Description of the activity Predecessor Duration (days)
A designing the robot - 20
B Building the prototype A 10
C testing the prototype B 8
D estimating the material costs A 11
E refining the design C,D 7
F demonstration E 6
G estimating labor D 12
H preparing the technical proposal E 13
I submission of the proposal G,H 5
Q1. List all the paths and their durations.
Q2. Identify the critical path(s) (by inspection).
Q3. Determine the critical path(s) using early start, early finish, late start and late finish times. Also identify all the critical and non-critical activities.