First time yield (FTY)

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    ​First time yield is a metric used to determine how a process is performing in relation to the number of good parts or services it produces.  In other words FTY measures the percent of non-defective units that are successfully produced from a process the first time through.  The metric is more specifically used to measure the ratio of parts made correctly the first time through.  First time through yield can help gauge whether or not a cell is making parts correctly the first time through.

How is it Calculated?

• The first-time yield can be calculated by dividing the number of good, conforming products or services by the total number of products or services produced in the sample lot or batch. 

Things to Keep In Mind

• First time yield is also referred to as first pass yield. 
• A good way to look at FTY is to consider your gap.  Your goal in any process is to have 100% good parts as an output.   This means that you can calculate an FTY Gap (100% minus current FTY) and this will help you reveal different forms of waste (defects) in your process that you may have an opportunity to remove.
• First Time Yield in a perfect world is a measurement of the capabilities at a sub-process level that later rolls up into rolled throughput yield.
• It is VERY important before measuring first time yield that you define what a defect is, as well as how those defects will be measured.

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