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Velocity & Ideal Day in Xp

mini mehta
Ranch Hand

Joined: Oct 22, 2000
Posts: 120
What does Velocity and an Ideal Day means in XP terms. Can you please give an example.
BTW Is Ideal day = 8 hours?
Ilja Preuss
author
Sheriff

Joined: Jul 11, 2001
Posts: 14112
An Ideal Day is a day of ideal flowing development without any disruptions. It's a more or less subjective unit for estimating effort. Many teams substitute it by even more arbitrary units like just Points or even "Gummy Bears"
Velocity is the measurement of how much effort you worked on in a fixed period. For example the team might have developed Stories worth 11 Story Points in the last iteration - its Velocity is 11. This value is used to predict how fast future development will be, so the team plans to work on Stories worth 11 Points for the next iteration (iterations have fixed length in XP).
See
http://c2.com/cgi/wiki?IdealProgrammingTime
http://c2.com/cgi/wiki?ProjectVelocity
http://c2.com/cgi/wiki?YesterdaysWeather


The soul is dyed the color of its thoughts. Think only on those things that are in line with your principles and can bear the light of day. The content of your character is your choice. Day by day, what you do is who you become. Your integrity is your destiny - it is the light that guides your way. - Heraclitus
 
It is sorta covered in the JavaRanch Style Guide.
 
subject: Velocity & Ideal Day in Xp