Measured Mile
A disruption analysis that compares a period of unimpacted work against the same work while impacted — using the project as its own control. Widely regarded as the most persuasive disruption method available.
Its power comes from what it does not need. Most disruption analyses depend on a theoretical productivity norm — an industry table, an estimate, an expert’s opinion — and every one of those can be attacked on the grounds that the norm was wrong for this project. The measured mile removes that argument entirely: it compares your crews against your crews.
And its weakness is the same fact from the other side. It requires period-by-period production data — installed quantities against allocated hours, week by week, granular enough to identify a genuinely unimpacted period — and that data must have existed at the time. Reconstructed after the fact, it fails exactly as a reconstructed site diary fails, and for the same reason.