IAS 19 Projected Unit Credit Method

How is the projected unit credit method applied under IAS 19?
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IFRS

IAS 19 Projected — Core Rule

Under IAS 19, the Projected Unit Credit (PUC) method is the mandatory actuarial technique for measuring defined benefit obligations (DBO), attributing one unit of projected benefit entitlement to each year of employee service and discounting that unit to its present value.

How IAS 19 Projected Works