How much did the event move the planned Completion? The question never changes, but the way NEC expects you to answer it has, from NEC3 CL63.3 through NEC4 2017 and the 2019 amendments to CL63.5.
Written by Ahmed Sherif, a civil engineer and leader in construction and planning management with 25 years on UK multi-sector schemes and 250+ tenders behind him, this guide shows you how to model a CE time impact assessment correctly under each version of the contract.
Inside you'll learn:
Why the dividing date creates six assessment combinations, and how to model each one
The two-stage update under NEC4 2019, and how EOT1 + EOT2 build the full entitlement
Why "update to the dividing date, insert the CE" hides delay when the CE work is already as-built
The three principles behind the modelling, and why NEC has no concurrency issue when the model is right
Each section opens with a question to test your current thinking, and every combination is illustrated with a clear programme diagram. For planners, project controls professionals, commercial managers and anyone assessing or reviewing compensation events.
Compact & easy to read, 44 A5 pages, with plenty of illustrations. Instant PDF download after purchase.
© 2026 AKS Engineered Planning Ltd. All rights reserved. This booklet is licensed for your personal use only. Copying, sharing, reselling or distributing any part of it, in print or digitally, is strictly prohibited
How much did the event move the planned Completion? The question never changes, but the way NEC expects you to answer it has, from NEC3 CL63.3 through NEC4 2017 and the 2019 amendments to CL63.5.
Written by Ahmed Sherif, a civil engineer and leader in construction and planning management with 25 years on UK multi-sector schemes and 250+ tenders behind him, this guide shows you how to model a CE time impact assessment correctly under each version of the contract.
Inside you'll learn:
Why the dividing date creates six assessment combinations, and how to model each one
The two-stage update under NEC4 2019, and how EOT1 + EOT2 build the full entitlement
Why "update to the dividing date, insert the CE" hides delay when the CE work is already as-built
The three principles behind the modelling, and why NEC has no concurrency issue when the model is right
Each section opens with a question to test your current thinking, and every combination is illustrated with a clear programme diagram. For planners, project controls professionals, commercial managers and anyone assessing or reviewing compensation events.
Compact & easy to read, 44 A5 pages, with plenty of illustrations. Instant PDF download after purchase.
© 2026 AKS Engineered Planning Ltd. All rights reserved. This booklet is licensed for your personal use only. Copying, sharing, reselling or distributing any part of it, in print or digitally, is strictly prohibited
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