What's the difference between effort-based, amount-based, and percentage-based performance measures?

Performance measures that are based on effort hours are effort-based. Examples are, actual spent labor effort and actual spent equipment effort.

Performance measures that are based on currency values are amount-based. Examples are, actual revenue and actual raw cost.

Performance measures that are based on percentages are percentage-based. Examples are, actual margin percentage and actual nonbillable cost percentage.

Note: KPIs that are percentage-based can be tracked at the task, resource, and project levels.