CSs and KPIs are the two core metrics used within a business to track progress or success. What is the relationship between CSs and KPIs?

$"$CSFs are business strategy elements, where KPIs measure the progress of the CSFs$."$

$"$ CSFs build the business environment, where KPIs explain how to build the CSFs$."$

$"$ KPis are used first, where CSs are applied after."

$"$ KPis promote employees on their performance, where CSs demote employees based on their performance level."