Delay Analysis Methods
Measured Mile
Measured mile analysis quantifies lost labor productivity by comparing the actual production rate achieved during an unimpacted period of work against the rate achieved during a disrupted period, using the project's own real data for both.
Definition
Rather than relying on an external productivity benchmark or an estimating manual's assumed rate, measured mile analysis uses the same project's own actual, contemporaneous experience for both the unimpacted ("measured mile") and impacted periods -- the same crew, similar conditions, differing only in whether the disruption was present. The difference between the two periods' production rates (e.g. labor hours per unit of work), multiplied by the quantity of work performed during the impacted period, yields the excess labor hours attributable to the disruption. Its use of the project's own real data for the comparison baseline is what makes it one of the more widely accepted methods for quantifying loss of productivity.
Example
A pipe-installation crew averages 0.80 labor hours per linear foot during an unimpacted four-week period, then 1.20 hours per foot during a later period disrupted by trade stacking -- a 0.40 hour-per-foot excess, multiplied by the impacted quantity, to calculate total excess labor hours.