Scrum:

☛ Scrum teams usually have to work in iterations called sprints which usually last up to two weeks to one month long

☛ Scrum teams do not allow change into their sprints

☛ In scrum, the product owner prioritizes the product backlog but the team decides the sequence in which they will develop the backlog items

☛ Scrum does not prescribe any engineering practices

Extreme Programing (XP):

☛ XP team works in iteration that last for one or two weeks

☛ XP teams are more flexible and change their iterations

☛ XP team work in strict priority order, features developed are prioritized by the customer

☛ XP does prescribe engineering practices