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Schedulingaka: 3-week look-aheadaka: short-interval scheduleaka: weekly work plan

Three-Week Look-Ahead

In Plain English

A weekly-updated field schedule showing exactly what work is planned task-by-task for the next three weeks.

Definition

A three-week look-ahead is a short-interval schedule prepared weekly by the superintendent or project team that shows all planned work activities for the next three weeks in a task-specific format. It identifies required materials, inspections, subcontractor mobilizations, and equipment needs on a daily basis. The look-ahead drives weekly subcontractor coordination meetings and is a core tool in the Last Planner System.

Why It Matters in Bidding

The three-week look-ahead is where the bid estimate meets field reality, translating the master schedule into actionable subcontractor commitments. For estimators and project teams, it surfaces material lead-time and crew-availability problems early enough to protect the as-bid sequence and avoid the acceleration costs that erode the original margin.

Example

At the weekly coordination meeting, the superintendent uses the three-week look-ahead to confirm the masonry sub will be staffed and the rebar delivered before the scheduled wall pour, preventing a stacking-of-trades conflict that would have triggered overtime.

Related Terms

Look-Ahead SchedulePull PlanningLean ConstructionGantt Chart

Frequently Asked Questions

The superintendent or project team typically prepares and updates it weekly, pulling activities from the master CPM schedule into a near-term, task-level format. Subcontractor foremen contribute their planned work and constraints, making the look-ahead a collaborative commitment document rather than a top-down directive handed to the crews.
The master schedule covers the whole project at activity level for contractual milestones, while the look-ahead zooms into the next 21 days at daily, task-specific detail. It captures constraints like inspections, deliveries, and crew mobilizations that the high-level CPM omits, making it the practical tool for short-interval field execution.
Three weeks balances enough lead time to clear material and inspection constraints against the accuracy limits of near-term planning. It aligns with typical procurement and submittal turnaround while staying short enough that commitments remain reliable. Some teams adjust the window, but three weeks is the common Last Planner System default.

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