What is the difference betweem scrum model,xp model and fdd
model?

Answer Posted / edlis renyta

1.Scrum teams typically work in iterations (called sprints)
that are from two weeks to one month long. XP teams
typically work in iterations that are one or two weeks long.
2.Scrum teams do not allow changes into their sprints. Once
the sprint planning meeting is completed and a commitment
made to delivering a set of product backlog items, that set
of items remains unchanged through the end of the sprint.
XP teams are much more amenable to change within their
iterations. As long as the team hasn’t started work on a
particular feature, a new feature of equivalent size can be
swapped into the XP team’s iteration in exchange for the
unstarted feature.
3.Extreme Programming teams work in a strict priority
order. Features to be developed are prioritized by the
customer (Scrum’s Product Owner) and the team is required
to work on them in that order. By contrast, the Scrum
product owner prioritizes the product backlog but the team
determines the sequence in which they will develop the
backlog items. I’ve never seen a Scrum team not choose to
work on the highest-priority item. And a Scrum team will
very likely choose to work on the second most important.
However, at some point one of the high priority items may
not be a good fit for the sprint being planned—maybe a key
person who should work on it will be swamped by work on
higher priority items. Or maybe it makes sense to work on a
slightly lower priority item (let’s say #10 on the product
backlog instead of #6) because the team will be working in
the code where #10 would be implemented.
4.Scrum doesn’t prescribe any engineering practices; XP
does. I love the XP engineering practices, particularly
things like test-driven development, the focus on automated
testing, pair programming, simple design, refactoring, and
so on. However, I think it’s a mistake to say to the
team “you’re self-organizing, we trust you, but you must do
these specific engineering practices….” This sends a mixed
message to the team that causes confusion. I love the XP
practices but don’t like mandating them. I want teams to
discover the value on their own.

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