In my conversation with Clyde, I asked Clyde to identify what was most important to him. When Clyde said the big program was going to start in ten weeks, it was clear the date was the driver.
Early in the project, everything seems possible, especially if no one has tried to estimate anything. Your sponsor may say, “We want this project to have these five features, be done by August 1, and have no critical defects. And we want you to bring it in under a million bucks. You have these six people. OK?”
Don’t say OK.
Once you estimate the work, you can see whether those six people really can do that work for the money and time. If they can, great. But more likely, it’s not possible to do everything your sponsor ...