First Lookahead generation

When you generate the first Lookahead, Lean PlanDo reschedules activities that are in progress and activities that have not started. Read this to understand why your dates move.

• Activities with no progress that were planned to start in the past: the whole activity moves to start on the Lookahead date, if none of its predecessors are in progress.
• Activities in progress: the remaining portion is set to resume on the Lookahead date.

Two examples follow.

Case 1: activity in progress (Activity 2)

Before Lookahead generation:

After Lookahead generation:

The remaining portion of Activity 2 is rescheduled. Its RES (Remaining Early Start: the date the remaining work of a started activity or task resumes) is now the Lookahead date.

Case 2: predecessor and successor both in progress

If the activity in progress has a predecessor, its remaining portion keeps the link to that predecessor after Lookahead generation.

Before Lookahead generation:

"Successor in progress" has some progress. It has an FS0 link to "Predecessor in progress" (finish-to-start with a lag of 0 days: it starts right after the predecessor ends).

After Lookahead generation, with a Lookahead date of 3 Feb, the RES of "Successor in progress" still respects the FS0 link to the end date of "Predecessor in progress".

How the project delay is recorded

After the first Lookahead generation, Insights records the number of days the project has moved forward or been delayed. The delay reason is Delay on first lookahead generation.

These days come from the critical activities that were rescheduled during the first Lookahead generation.