Our lecture has introduced us to a waiting time model for systems which are subject to variability (demand or process) variability.

where

p is the average processing time

a is the average interarrival time

m is the number of servers

and utilization, u = p/(am)

This model is valid when u < 1.

CVa and CVp are the coefficients of variability for arrivals and processing, respectively.

Looking at the equation for Tq, how would you go about decreasing the average waiting time for a specialty coffee shop?

Select one:

a. Decrease the number of employees.

b. Standardize the coffee-preparation process so that the average processing time is reduced.

c. Allow employees a 30 second break between serving customers.

d. Install a television for customers that are waiting (the program distracts them, and they are less angry when they finally are served).