People Communicate Most Effectively Face-to-Face Richness of the communication channel Communication effectiveness 2 people at whiteboard 2 people on phone 2 people on email Videotape Paper
How XP Solve Some SE Problems Intensive teamwork Staff turnover Changes are welcome Business changes Customer part of the team Misunderstand the business Unit tests, customer tests Defect rates Extensive, ongoing testing, system always running Cost of changes Intensive customer presence Cancelled project Short development cycles Slipped schedule Solution Problem