Claims & Delay Analysis
Time Impact Analysis (TIA)
A Time Impact Analysis is a forensic scheduling method that inserts a delay event as a fragnet into the schedule at the time it occurred, to measure exactly how much it pushed back the project finish date.
Definition
Time Impact Analysis (TIA) is one of several recognized forensic delay-analysis methodologies (alongside as-planned-vs-as-built, windows analysis, and collapsed as-built). A TIA takes the schedule update immediately before a delay event occurred, inserts a small network of new activities (a 'fragnet') representing the delay event and its actual duration, and recalculates the schedule to see how much the projected finish date moves. Because it's rooted in the schedule as it actually stood at that moment -- not a schedule reconstructed after the fact -- a well-executed TIA is generally considered one of the more defensible delay-analysis methods, provided the schedule it's built from was itself a reasonably reliable, DCMA-compliant network at the time.
Example
A scheduler takes the March schedule update, inserts a 20-day fragnet representing a permit delay that began March 10, ties it into the existing logic at the correct point, and recalculates -- showing the project finish date moves out by 12 days once the fragnet's own float within the network is accounted for.