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What is Operations Management?
Managing...
1. the transformation of an input rate into an output rate
2. to match an demand rate and make money or achieve non for profit objectives
What are the two types of variation?
common cause variation
natural; system is fully under control; can never be eliminated
special cause variation
should be eliminated; Handschuhe und Brille beim Darts Beispiel
Why is it important to measure inventory in money not in products/units ?
Because if there are several different products the number of units is useless
What does the average inflow rate and the average service time give?
Average inflow rate = how many customers per hour/minute
Average service time = How long does it take to serve customer
What does the Erlang Loss Formula give?
r = p/a
Look up r in the Erlang Loss Table and find out how much percent of the whole time the process is busy (all servers are busy)
Why are buffers needed in general?
Because without buffers flow units cannot wait but simply go from step to step which can cause extremely high trouble when a station needs more time than the other (buffers are used as simple waiting rooms)
What does Years/Months/Days of Supply measure and how is it calculated?
T = I/R I=Inventory and R=COGS
How long does money stay in a company until it turns to revenue?
How long has one passenger have to wait in average?
What is a production cycle?
A repeating sequence of produced units
What are examples for a typical situation with patient customers and vice versa?
patient = supermarket (when you put your things in the cart you have to get to the checkout)
inpatient = backery (if you get there and see a long line you can leave without even getting into the queue)
As customers do not come in a constant rate but in peaks - how can one manage those peaks?
Reduce demand (off peak discount) or increase capacity (increase resources or pre sale)
Was ist der Unterschied zwischen "do the right things" und "doing things right"?
Do the right things = Effektivität
Do things right = Effizienz
Explain power of pooling
Neither more or faster work
Pooled process uses available capacity more efficient
Pooling prevents that one resource is idle while the other faces backlog
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