Table 7-1. Metrics for value stream mapping Metric What it measures Lead time (LT) The time from the point a process accepts a piece of work to the point it hands that work off to the next downstream process Process time (PT) The time it would take to complete a single item of work if the person performing it had all the necessary information and resources to complete it and could work uninterrupted Percent complete and accurate (%C/A) The proportion of times a process receives something from an upstream process that it can use without requiring rework
