Retrospective longest path analysis
Network analysis can help identify the interrelationships between tasks that make up complex processes and establish the most appropriate timing and sequence for their execution. The critical path is the path through the network that requires the longest period of time to progress from start to completion. This is the minimum timeframe necessary to complete the whole project.
Retrospective longest path analysis involves the determination of the retrospective as-built critical path.
This first requires the development of a detailed as-built programme. It is then possible to trace the longest continuous path backwards from the actual completion date to determine the as-built critical path. The incidence and extent of critical delay can then be determined by comparing key dates along the as-built critical path with the corresponding planned dates in the baseline programme. It is then possible to study project records to determine which events may have caused any critical delays identified.
This method only has limited capacity to recognise changes to the critical path during the course of the works.
Ref The Society of Construction Law Delay and Disruption Protocol, 2nd edition, published in February 2017 by the Society of Construction Law (UK).
[edit] Related articles on Designing Buildings Wiki
Featured articles and news
Creativity, conservation and craft at Barley Studio. Book review.
The challenge as PFI agreements come to an end
How construction deals with inherit assets built under long-term contracts.
Skills plan for engineering and building services
Comprehensive industry report highlights persistent skills challenges across the sector.
Choosing the right design team for a D&B Contract
An architect explains the nature and needs of working within this common procurement route.
Statement from the Interim Chief Construction Advisor
Thouria Istephan; Architect and inquiry panel member outlines ongoing work, priorities and next steps.
The 2025 draft NPPF in brief with indicative responses
Local verses National and suitable verses sustainable: Consultation open for just over one week.
Increased vigilance on VAT Domestic Reverse Charge
HMRC bearing down with increasing force on construction consultant says.
Call for greater recognition of professional standards
Chartered bodies representing more than 1.5 million individuals have written to the UK Government.
Cutting carbon, cost and risk in estate management
Lessons from Cardiff Met’s “Halve the Half” initiative.
Inspiring the next generation to fulfil an electrified future
Technical Manager at ECA on the importance of engagement between industry and education.
Repairing historic stone and slate roofs
The need for a code of practice and technical advice note.
Environmental compliance; a checklist for 2026
Legislative changes, policy shifts, phased rollouts, and compliance updates to be aware of.