What are the components of the following systems? Explain the configuration of each.

• barbershop

Barbershop is a single phase system with single to multiple services that rely on the size of the shop.It serves on a first-come-first-serve basis (FIFO). There is no priority scheme used. The arrival rate of customers is lowbecause the hair cut is not done everyday and the presence of several options available to the customer. It is considered as a negative exponential distribution.

• car wash

Can be viewed as a multiphase system as the car is washed in one station and cleaned in another station. The vehicle is then taken to the customer at a different station. It has a single entry point but with two or more stationsto pay, wash, vacuuming, and drying of the cars. It also has a single queuing line because cars only can be brought for cleaning from a given location. Arrival rate of cars for washing is frequent and works on a first come first serve basis. It can be considered as a negative exponential probability distribution.

• Laundromat

It is a multiphase and multichannel system because it consists of different stations for washing, drying, and even ironing. It is characterized by a high rate of arrival and services are offered randomly. The waiting time is average because of the multiple channels available.

• small grocery store

Most small grocery stores have a single queuing channel with one person serving the customers. It is, therefore, a single phase system because all the requests and service delivery are done at a given station. It is characterized by more average waiting time because only one person deals with the customers, who may be many.

 
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