This is a real change in mindset for many teams. People on a team that’s used to treating a plan as a set of optimistic goals often find themselves struggling and failing to meet those goals. After all, it only takes one overly optimistic team member or manager to ruin everyone’s plan (and the next four weekends), even if he thinks he’s helping at the time. On the other hand, if the team treats the plan as their most realistic attempt at writing down what they think will actually happen over the next 30 days, they’re much less likely to bite off more than they can chew—and much more likely to come in on time without cutting corners, taking shortcuts, and ending up with fragile code.
This is important