Intended learning outcomes: Calculate a scheduled network with incomplete data for six operations and a start operation (administration time. Determine the critical path.
Figure 13.7.3.1 shows a scheduled network with incomplete data for 6 operations and a start operation (administration time).
Fig. 13.7.3.1 Scheduled network (for you to complete).
a. For each process, please fill in the earliest start date (ESD) and the latest start date (LSD) in the scheduled network. What is the critical path, that is, the path with the longest duration? What is its lead-time margin, that is, the slack time?
b. The operation time for operation 6 has not yet been determined. What is the longest possible time for operation 6 (lead-time margin = zero)?
Solutions:
a. For the time being, as long as the time for operation 6 is still open, the longest path is (start – op1 – op3 – op5 – end). Lead-time margin = 7.
b. As soon as the time for operation 6 is greater than 4, the longest path is (start – op1 – op3 – op6 – end). The longest possible time for op6 is 11.
Course section 13.7: Subsections and their intended learning outcomes
13.7 Scenarios and Exercises
Intended learning outcomes: Assess queues as an effect of random load fluctuations. Calculate examples for network planning, backward scheduling, forward scheduling, the lead-time stretching factor, and probable scheduling.
13.7.1 Exercise: Queues as an Effect of Random Load Fluctuations (1)
Intended learning outcomes: Answer a number of questions using the relevant formulas in queuing theory.
13.7.2 Scenario: Queues as an Effect of Random Load Fluctuations (2)
Intended learning outcomes: Experience average wait time as a function of capacity utilization in a job shop environment with random arrivals, execution of operations in order of arrival as well as operation times subject to a determinate distribution with mean and coefficient of variation.
13.7.3 Exercise: Network Planning
Intended learning outcomes: Calculate a scheduled network with incomplete data for six operations and a start operation (administration time. Determine the critical path.
13.7.4 Exercise: Backward Scheduling and Forward Scheduling
Intended learning outcomes: Explain and solve the forward and backward scheduling problems that is calculation of start and completion dates for the order and each operation, as well as the critical path and lead-time margin.
13.7.5 Exercise: The Lead-Time-Stretching Factor and Probable Scheduling
Intended learning outcomes: Explain and practice the use of the lead-time-stretching factor as well as probable scheduling.
