Remember that a chain is only as strong as its weakest link

There are various domains in projects, and they all need attention; we must have a holistic perspective of the project. Paying attention to a seemingly important domain (e.g., time) is not enough, because all domains interact and they don’t work properly unless they all receive adequate attention.

It’s common for project managers to spend too much time scheduling the project and yet not spend enough time on other aspects of management, which in turn makes the scheduling almost useless. We must pay attention to every aspect.