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Examples of methods used by Sand Hill, Inc. include:
As-Planned vs. As-Built
The As-Planned vs. As-Built methodology requires the project was built via the original plan and has an agreed-upon or verifiable As-Built schedule. This method can be as simple as graphically comparing the As-Planned or “baseline” schedule to the As-Built schedule and evaluating variance, or as complex as comparing both start and finish dates, durations and even activity sequence in the analysis.
Time Impact Analysis (TIA)
Time Impact Analysis is best used as a forward looking estimation of the impact of a specific event. The schedule should be updated to the event; a “what-if” schedule should be created demonstrating the impact of the event, that schedule completion date should be compared with the “baseline” completion date. The difference between the completion dates of the two schedules is the impact of the event on the project. Modification of contractual documents will be necessary upon acceptance via the methods established in the change management portion of the project planning phase.
Window Delay Analysis
Window Analysis is a general term that refers to the analysis of schedules that are divided into segments. Given appropriate documentation, a meaningful “baseline schedule”, Window Analysis allows the understanding of the impact of events during specific time periods (either predetermined; i.e., weekly, monthly or around specific events). Window Analysis is often completed in a similar manner to Time Impact Analysis; Window Analysis is often performed retrospectively, while Time Impact Analysis is best used as a prospective tool.
The Collapsed As-Built delay analysis method begins with an As-Built schedule and removes activities to determine the impact of their inclusion in the As-Built schedule. It is the opposite of Window Analysis, which relies on an accurate baseline schedule, instead providing meaningful information when the most reliable documentation is the As-Built.