When a project falls behind, the question is not simply whether delay occurred. The harder question is how to analyse it properly. Different methodologies can produce very different answers if they are applied without proper regard to the project facts and the available records.
There is no single best method in every case
Impacted as-planned analysis, time impact analysis, windows analysis and as-planned versus as-built comparisons all have their place. The right choice depends on the timing of the exercise, the quality of the records, the available programme updates and the purpose of the analysis.
A method that is suitable for a live extension of time application may not be the best fit for a retrospective forensic review after completion.
Use the project facts, not the analyst's preference
A sound method should fit the contract, the project records and the way the works were actually delivered. If the available programme updates are sparse or unreliable, that will affect what can credibly be done. If the project is complex and the critical path moved over time, a more detailed approach may be justified.
The Society of Construction Law guidance is helpful here: the method should make sense in the real world and should be proportionate to the issues in dispute.
Prospective and retrospective exercises have different uses
During the project, a prospective approach can help the parties assess the likely impact of a delay event and deal with entitlement promptly. After the event, a retrospective approach may be needed to understand how the project actually progressed and which events truly drove completion.
The important point is not to force every situation into the same template. The analysis should answer the question that the project or dispute genuinely requires.
Inputs and assumptions still matter
No methodology is stronger than the programme data, progress information and factual assumptions behind it. Analysts need reliable dates, sensible logic, clear records of change and a proper understanding of what was critical at the time.
That is why experienced delay input can add real value. A good analyst not only applies a method, but also explains clearly why that method fits the circumstances.
Key Takeaways
- There is no universal delay analysis method that works best in every dispute.
- The right methodology depends on the contract, the records, the timing of the exercise and the complexity of the delay issues.
- Prospective analysis is often useful during delivery; retrospective analysis is often needed once the facts are complete.
- A credible outcome depends as much on the quality of the inputs and assumptions as on the method itself.
Key Points
- Delay analysis methodology should be selected based on the project facts, not analyst preference.
- Prospective delay analysis supports live extension of time applications; retrospective analysis suits post-completion disputes.
- Input quality determines the credibility of any delay analysis outcome.