The Pros and Cons of Impacted As-Planned Analysis - a Delay Expert Guide
When reviewing which type of delay analysis is most important for a specific case, it’s worth considering the pros and cons of the most commonly accepted methodologies.
One of the most popularly used methods is the Impacted As-Planned method of delay analysis.
Delay Expert, Andrew McKenna discusses to pros and cons of the Impacted As-Planned method of delay analysis.
What is Impacted As-Planned Analysis?
Almost as simple as as-planned v as-built. A prospective methodology that relies on impacting the originally planned sequence of works (‘the baseline’ plan) with the delay event(s). Ideally this program was approved commensurate with the commencement of the works.
The Pros
Quick to produce
Depending on the complexity of the program, easy to understand;
Demonstrates the criticality (the critical path) of the delay event(s) on the original, planned sequence;
Demonstrates causation;
Does not rely on as-built information, incase as-built information is not available;
Useful as a ‘litmus’ test, prior to a further, more detailed analysis.
There are also a handful of cons that must be considered when reviewing the appropriateness of using the Impacted As-Planned method of delay analysis
The Cons
The impacted as-planned program rarely reflects what actually happened;
The analysis is hypothetical and prospective, therefore delay cannot be used to determine cost;
The baseline might contain errors;
Does not consider progress or concurrency;
Almost no judicial support. Refer: Great Eastern Hotel v Laing Construction Ltd [2005] EWHC 181.
To deliver an Impacted As-Planned delay analysis, a delay expert requires an as-planned program with accurate logic links between activities and a critical path that reacts to change. It also requires that the baseline program should still be relevant at the time of the delay event i.e., nothing has significantly changed (other than the delaying events). Finally, it requires the quantification of the duration of the delay to be ‘spliced’ between the respective impacted program activities.
At Accura Consulting, our team of experts work with clients to create a tailored solution to problems. If you have an issue and want expert support, get in touch.
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