Các phương pháp này được gọi là hạng nhẹ để tương phản với các phương pháp hạng nặng (heavyweight methods) thiết lập dựa trên các tiêu chuẩn ISO9001, CMM hay RUP. Trong số các phương pháp hạng nhẹ, XP đã nhận được sự quan tâm nhiều nhất vì nó đã đề ra hai mục tiêu rất rõ ràng và cần thiết cho CNPM | As the developers become more comfortable with the stories they begin writing estimates on them. These estimates 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 perfect 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 previous team s. However I met with the team yesterday afternoon 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 estimates 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. 35 You reply OK so we ve got our .
