TAKT time

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    Manoj Thomas

    I work as a Black Belt in a services Industry and have a question on the applicability and calculation of TAKT Time.
    I have 5 (A, B, C, D, E ) processes for which we did a End to End LEAN Value Stream. The number of people in each process is different ( 2, 3, 3, 1, 1) . The total available time also varies in all the processes – in hours ( 4, 6, 8, 8, 2 ) .The inventory at each step is ( 10, 12, 5, 5, 10)  if  i now need to use the TAKT formula what is the available time i will use ? The customer on an average sends 50 requests to be setup.
    Secondly, The observed wait times at each step are – in hours ( 30, 20, 20,10, 10) . How do i account for the inventory pending at each step in the Wait time ? ( We have been internally asked to multiply Inventory * TAKT time + Observed Wait time to get the Correct Wait Time ) is this correct ?
    What happens in cases where you are not able to get the Wait time due to lack of a measurement system etc .. how do we account for this in the Time Ladder
    What is the critical path ?
    Manoj Thomas

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