Little Law and WIP calculation

#1
Hi all,
I have a question around the Little law
1. PLT = WIP/Exit rate
For example I have 5 station. If i want to calculate the Wip at station 4 and the bottle neck is at station 3.
Q1/Then the PLT time count from station 1 to station 4?
Q2/The WIP is calculated for whole process from 1 to 4 or just between station 4 and 3 only?
2. SWIP =manual time/takt time
Q3/Use the example above what is this SWIP for. Is it for the whole 4 station which is (CT1+CT2+CT3+CT4)/Takt time) = SWIP 1=SWIP2=SWip3= SWIP4or this formula is for each station like SWIP 1= CT1/Takt time
Thank you all!
 
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