Yield First Time
[Pages:2]Yield ? First Time
Purpose
To calculate the ratio of the number of units accepted to the total number of units inspected. This calculation of process performance represents the classical view of Yield.
Anatomy
Yield - First Time
InInppuut t D
A C
Y = S L
M
FT U
fCofCorarlFaclFiucrisluratsltaTtiotiTimnoimnePePoYioYineiitnledtld
OOppeeraratitoionn
Operator Verify
Inspection
OOuutptpuut t
Not OK
RReewwoorkrk
Not
OK
B
SSccrarapp
E
Six Sigma - Tools & Concepts Reference: The Vision of Six Sigma: A Roadmap for Breakthrough Ch. 14
Yield1st_001
Terminology
A. Process Operation Step including operator self-check/verification B. Process Inspection/Test/Verification Step C. Point at which YFT is calculated, considering the number of units tested (U) and the number of units
that pass inspection (S) D. Process Rework Step E. Scrap
Major Considerations
Calculation of Process Yield using First Time Yield formula does not reflect the true process effectiveness. It often leads to an overvalued calculation of the true Yield, and has no practical meaning other than the ratio of successes over units tested. First Time Yield should not be used in practice. YFT does not take into account the "Hidden Factory".
Copyright ? All Rights Reserved
Application Cookbook
1. Count the number of units inspected or tested (U) 2. Count the number of units that pass the inspection/test requirements (S) 3. Apply the formula YFT , expressing the result as a percentage
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