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§ Partly as a consequence of the previous point, we will not distinguish between types of employees; each employee costs the same, per hour, as any other employee.

3.5.2.Mathematical Model:

The arrival rate: When arrivals into a queuing system are independent (i.e. the fact that a person or party enters the shop during a given minute has no effect on whether another party enters the shop during any other minute), the arrival process is said to be a Poisson process, and the time between arrivals is a random variable which follows the Exponential distribution. This distribution is described by the following probability distribution function:

f(t) = λe-λt

1/λ = average interarrival time

The service time: The same distribution will be used for the service time (the time from the moment the customer's order is taken to the moment the order is filled), but it is customary to employ μ (instead of λ) for the service rate:

f(t) = μe-μt

1/μ = average time to service an order

3.5.3. Computational Model:

From the Exponential distribution, we will need to transform the numbers returned from the Uniform distribution, as follows:

tarrival = -ln(1-uarrival) / λ

tservice = -ln(1-uservice) / μ

The average number of customers in the system (L)19.00

The average number of customers in the queue (Lq)18.05

Average time in the system per customer (W)30.00minutes

Average time in the queue (Wq)28.50minutes

Propability that the server will be busy (U)0.950

Probability that customers must wait P(0)0.050

3.5.4. Psychology of Waiting Line

Due to characteristics of coffee service, Waiting Line is different from this of other services. Apart from free internet access, shelfs of magezines, newspapers, and music. The coffee shop will have decoration on the wall along with pictures of art schools in the world. This make guest feeling of going to an art museum of the world.

4. Service layout

4.1. Site selection

Location plays an important role in the success of project of services business. Good location ease the process of doing business, competitive and highly profitable.

On the basis of business strategy, business objectives and financial capabilities, we selected sites based on the following criteria:

Features and consumption habits of target customers: Focus on densely populated areas , office buidings, industrial areas .

Focus on the segmentation: the white -collar workers .

Cost: space, power, water, labor

Conveniently situated on a two -way street in Tan phu district .

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