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In a use case diagram what is the difference between <<includes>>, <<extends>> and <<uses>>? Are <<includes>> and <<uses>> are the same thing?
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The include relationship supports the reuse of functionality in a use-case model. In UML modeling, you can use an extend relationship to specify that one use case (extension) extends the behavior of another use case (base).
In simple words, the difference between include and extend is that 'include' is for adding methods only to an instance of a class and 'extend' is for adding methods to the class but not to its instance.
"includes" and "uses" indicates the mandatory use case where as "extends" indicates the optional use case.
includes and uses are the same. From http://www.agilemodeling.com/essays/useCaseReuse.htm above
An include dependency, formerly known as a uses relationship in UML v1.2 and earlier
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