Time Impact Analysis
A forensic scheduling technique that inserts a specific delay event into a copy of the project schedule at the point it actually occurred, to isolate and measure exactly how many days that one event pushed out the project's completion date, distinct from simply comparing the original and final schedules after the fact.
Why it matters
Isolating one event's actual impact matters most when several delays happened close together, without a time impact analysis, it's easy to credit or blame the wrong event for a schedule slip that several things contributed to at once.
On a real project
A scheduling consultant inserts a differing site condition, an unmapped utility line that stalled excavation for ten working days, into a copy of the project's baseline schedule at the exact point it occurred, showing that specific event pushed the completion date back by exactly ten working days, isolated from any other delays that happened later.
Who this matters most to
A Scheduling & Delay Consultant performs the time impact analysis, the technical basis behind most serious delay claims.
Where this goes wrong
A contractor's delay claim asserts a specific owner-caused event pushed the whole project back by six weeks, but without a time impact analysis actually isolating that one event's effect, the claim can't distinguish that owner-caused delay from other, contractor-caused slippage happening around the same time. The owner's counsel picks the claim apart on exactly that gap.