[quanticle]

>I think this is when a manager is supposed to add resources.

No, no, no, a thousand times no. Software isn't an assembly line. It's not piece work. Adding more people to a late project only makes it later, as the existing dev team has to work to bring the new hires (even if they're experienced developers, they're still new to the project) up to speed. Adding more resources to a late project, without accounting for a period of reduced productivity is the absolute worst thing management can do. I have literally seen projects go from, "Well, it's borderline, but we can deliver if we work weekends," to, "There is no way we can do this by the delivery date," because management decided to add two new developers to the team.

The worst thing is, Fred Brooks published a book talking about this phenomenon in the '70s: The Mythical Man Month. And somehow, the lesson still hasn't sunk in.