Formules OML

 lambda mean arrival rate
 mu mean service rate

p  average system utilizatio n

Note :    for system stability. If this is not the case,
an infinitly long line will eventually form.


L average number of customers in system
 
Lq  pL average number of customers in line
1
W average time in system including service 
 
Wq  pW average time spent waiting
Pn 1  p p n probabilit y of n customers in the system
at a given point in time

, Flowchart - a diagram of Pareto chart - help to
Run chart - depict trends
the sequence of break down a problem
in data over time
operations into components




Checksheet - basic form Histogram- divides the Scatter diagrams-
to standardize data range of data into present the association
collection classes between two variables



Fishbone diagram - Opportunity flow
Control chart - used to
shows relationships diagram - used to
assure that processes
between causes and separate value-added
are in statistical control
problems from non-value-added