1. 如何估算我们这个sprint能做多少个故事点
1) 本能反应
2) 生产率计算
估算生产率/实际生产率
看看团队的历史，看看他们在过去几个sprint里的生产率是多少
然后假定在下一个sprint里生产率差不多
This is also called yesterday's weather
Sprint's Focus Factor
[Actual Velocity]
[Focus Factor] = ---------------------
[Available Man-Days]
eg:
last sprint's focus factor:
18 story points
40% = ----------------
45 man-days
this sprint's estimated velocity:
50 man-days X 40% = 20 story points