If you need to prove and allocate construction project delays, you should engage a scheduling consultant qualified with CPM (critical path method) analysis. You should also engage counsel to assist in preserving your rights, as well as presenting and maximing your arguments for delay.
There are numerous methodologies used to quantify and allocate delay. You want to discuss the most effective analysis for your case and facts including whether you want/should use a forward-looking prospective analysis or a backward-looking retrospective analysis that factors in as-built data. In doing so, you want to make sure you understand the pros and cons of each methodology including the bases to attack the methodology that will be subject to cross-examination. The five primary CPM methodologies are as follows:
- As-Planned Versus As-Built. This methodology compares the as-planned baseline schedule to an as-built schedule reflecting progress to assign delay. An as-built schedule that reflects progress includes actual start dates, finish dates, and durations. The actual dates and durations are compared with the as-planned dates and durations on the baseline schedule to determine delay. Under this methodology, the delay impact is determined retrospectively.