Chances are that in some point of your life you have used some kind of Key Performance Indicators. With OKRs there are Key Results and that can be confusing. Don’t worry they are almost exactly the same thing. So, if you have used KPI’s you already have a upper hand in using key results.
The Key Result portion of the OKR is a measurement that supports the Objective. Therefore, the Key Result actually incorporates the KPI. In other words, everyone who uses OKRs is also automatically using KPIs.