Planning Extreme Programming - kent beck martin fowler phần 3 pdf

35

As the developers become more comfortable with the

stories, they begin writing estimates on them. These esti￾mates are crude and budgetary, but they give Jay an

idea of what the story will cost.

At the end of the meeting, it is clear that there are

many more stories that could be discussed. It is also clear

that the most important stories have been addressed,

and that they represent several months worth of work. Jay

closes the meeting by taking the cards with him and

promising to have a proposal for the first release in the

morning. ~ ~ ~ The next morning you reconvene the meeting. Jay

chooses five cards and places them on the table.

“According to your estimates, these cards represent

about one perfect team-week’s worth of work. The last

iteration of the previous project managed to get one per￾fect team-week done in three real weeks. If we can get

these five stories done in three weeks, we’ll be able to

demonstrate them to Russ. That will make him feel very

comfortable about our progress.”

Jay is pushing it. The sheepish look on his face lets you

know that he knows it too. You reply, “Jay, this is a new

team, working on a new project. It’s a bit presumptuous

to expect that our velocity will be the same as the previ￾ous team’s. However, I met with the team yesterday after￾noon, and we all agreed that our initial velocity should, in

fact, be set to one perfect-week for every three real￾weeks. So you’ve lucked out on this one.”

“Just remember,” you continue, “that the story esti￾mates and the story velocity are very tentative at this

point. We’ll learn more when we plan the iteration, and

even more when we implement it.”

Jay looks over his glasses at you as if to say “Who’s the

boss around here anyway.”, and then smiles and says

“Yeah, don’t worry, I know the drill by now.”

Jay then puts fifteen more cards on the table. He says,

“If we can get all these cards done by the end of March,

we can turn the system over to our beta test customers.

And we’ll get good feedback from them.”