Schedule slippage: is it the fault of the project manager or the managers?

Your project manager needs to create a reliable schedule… with resources that are beyond their control.
They plan, commit to dates, and anticipate risks. But they don’t have control over the actual availability of team members.

Why is it getting stuck?

Managers, however, have other priorities: the operational management of their team, daily emergencies, and their own objectives.
Project planning isn’t their focus.

They therefore often provide theoretical availability, which can change at the last minute.

Result:
The project manager discovers too late that a key resource is ultimately unavailable.
The schedule slips. Again.

The real problem

It’s not the planning.

It’s not the methodology.

It’s not the project manager.

It’s the lack of communication and synchronization between managers and the project manager.

As long as project needs and team constraints aren’t aligned smoothly and continuously, schedules will remain unstable.

The key

Create a shared space where:

• managers can easily indicate their actual availability,
• project managers can plan based on reliable data,
• everyone is alerted to any changes.

Because good planning isn’t just about organization…
It’s primarily about communication.