4. (a) Describe lean systems. What is the defining objective of lean? (b) What is the pull system and why is it a critical aspect of lean systems? (c) Why is achievement of reductions in setup time and setup cost critical to the success of lean systems? 5. (a) Contrast a project from a nonproject. What makes a process a project? Describe universal and common characteristics of a project. (b) What characteristic of the critical path makes it critical? How would a project manager manage critical path activities differently than noncritical path activities? What are the managerial implications? (c) What is "slack" (or activity slack) and why is it important? 6. Consider the following information about a small project: (a) Draw the network diagram. (b) Identify the critical path, earliest start and finish, latest start and finish, and activity slack for each activity. (c) How long will it take to complete the project? (d) What would happen if the estimated duration for activity F from #3 increases from two days to four days? Which path is the critical path? Would the project take longer? How long will it take to complete the project? Would anything else change? Wontare for Colmlotinn imite fne tha N _Chomt ond r 'hort