WFP functions lend themselves more readily to measurement than some other areas of HR:Business Impact Measures In addition to the return on investment (ROI) measures discussed in Chapter 2, employee productivity is a key measure for business impact in the WFP function. Productivity metrics are calculated by dividing total output (expressed in revenue dollars or [in manufacturing industries] by a measure of inventory output) by the number of employees. This metric can be calculated for the whole organization or by work groups, depending on specific information needs.Tactical Accountability Measures A number of established metrics can be used to measure HR’s tactical accountability in WFP. Some of the more common include the following: