NEC4: The Activity Schedule Explained

30 Mar 2026 · 60 min
59:55

This webinar, presented by Glen with contributions from David Allen (SECA Southern) and Ben (Gather), provides a detailed walkthrough of the NEC4 activity schedule, focusing on its purpose, preparation, and management under the two main contract options – Option A (price‑to‑contract) and Option C (target contract). The speakers explain that the activity schedule is a pricing tool, not a scope document, and is normally prepared by the contractor before contract signing. They compare how the schedule functions in Option A (as the basis for interim payments) versus Option C (as a target‑price reference), highlighting that only Option A links payments to completed activities, while Option C uses defined‑cost‑plus‑fee for payment and the schedule mainly supports forecasting and gain‑share calculations. The webinar covers the three contractual verbs – correct, revise, and change – detailing when and how a contractor must correct mis‑alignments with the scope or programme, when revision is required (only under Option A), and how price changes are handled through compensation events, defect acceptance, and acceleration. Two practical methods for updating the schedule after compensation events are demonstrated (Option 1 preserving the original total and adding separate CE lines, and Option 2 integrating net effects directly). The presenters discuss common pitfalls such as client‑prepared schedules, cash‑flow pressures, and the risk of relying on activity‑schedule prices for compensation‑event assessment. They stress the importance of aligning the schedule with the accepted programme, maintaining appropriate granularity for cash‑flow, and agreeing on record‑keeping for defined costs. The session concludes with advice that the contract does not require a revised activity schedule for every compensation event, and that collaboration and early agreement on documentation improve outcomes.

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