Windows analysis divides the project duration into discrete time periods (windows) and analyses the critical path and delay impact within each window independently. It is a retrospective methodology widely accepted in international construction disputes.
The methodology involves: (1) defining window boundaries (typically aligned with programme updates or key events), (2) identifying the critical path at the start of each window, (3) determining which delays affected the critical path during that window, (4) attributing those delays to the responsible party, and (5) aggregating the results across all windows.
Windows analysis is particularly effective for projects with complex, multiple overlapping delays because it considers the evolving nature of the critical path over time. The SCL Protocol recommends it as the preferred method for complex delay claims.