with all of the following changes in the same single model (not three separate models). Put a text box in your model with your results on the number of parts that both pass and fail inspection (which you can just read off of your f nal “frozen” animation), and at the inspection center, the average and maximum time in queue, the average and maximum queue length, and the utilization of the inspector resource. To help format your text box, choose the Courier New font in it; you might want to use Notepad or another plan-text editor (not word-processiong software) to compose your text-box contents, then copy/paste them into the Arena text box. ■ Add a second machine to which all parts go immediately after exiting the f rst machine for a separate kind of processing (for example, the f rst machine is drilling and the second machine is washing). Processing times at the second machine are independent of those from the f rst machine but drawn from the same distribution as for the f rst machine. Gather all the statistics as before, plus the time in queue, queue length, and utilization at the second machine. ■ Immediately after the second machine, there’s a pass/fail inspection that takes a constant 4.5 minutes to carry out and has a 75% chance of a passing result; queueing is possible for the single inspector, and the queue is f rst-in, f rst-out. All parts exit the system regardless of whether they pass the test. Count the number that fail and the number that pass, and gather statistics on the time in queue, queue length, and utilization at the inspection center. (HINT: Try the Decide f owchart module.) ■ Include plots to track the queue length and number busy at all three stations; put all queue lengths together in the same plot, and put all numbers busy in the same plot (you’ll need to turn on the plot Legends to identify the three curves). Conf gure them as needed. ■ Run the simulation for 480 minutes instead of 20 minutes.