Critical Success Factors (CSFs) are the few areas in which an organisation must achieve consistently high performance to meet its mission and strategic goals. To monitor whether a CSF is being achieved, a BA defines quantitative measures of performance, which are known as Key Performance Indicators (KPIs). KPIs are the specific, measurable metrics used to track and assess the success of an activity or the progress towards an objective. For example, if a CSF is 'Excellent Customer Service,' a corresponding KPI might be 'Average Call Waiting Time (less than 60 seconds)'---a clear, quantitative measure. While the Balanced Business Scorecard (D) is a framework that uses CSFs and KPIs, the specific quantitative measures themselves are the KPIs. Objectives (B) are the desired outcomes, not the measure of the outcome.

(Reference: BCS Foundation Certificate in Business Analysis / BCS Business Analysis Practice -- Strategic Context, CSFs and KPIs)

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