I want to know Begin Repairs

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At WQS RBD,  I figured out the formula that takes into account immediatly in begin repair category But I don't know the formula for upon system failure 

I hope you give me an answer

[VladimirN · Accepted solution]

 Hi,

1. Article - "How failure rate is calculated in the Windchill Quality Solutions RBD module": https://www.ptc.com/en/support/article/CS189640 

2. For more information, refer to the section "RBD Calculation Equations" in the PTC Windchill Quality Solutions Reference Guide: http://support.ptc.com/WCMS/files/157062/en/PTC_Windchill_Quality_Solutions_Reference_Guide.pdf