classumlassociationsclass-diagrammultiplicity
Class diagram multiplicity confusion
I am trying to draw a class diagram but i am not sure if what i am doing is correct or not.
Scenario In this university there is a rule that at most two lecturers teach a course. Every lecturer only teaches 0 to two courses.
Solution
Yes, it is correct; as a mnemotechnic you can read it as a sentence
"Lecturer teaches [0..2] Course(s)"
and
"Course is taught by [1..2] Lecturer(s)"
The multiplicity attached to the target end denotes the possible cardinalities of the set of target instances selected by the pairing of a qualified instance and a qualifier value.
(http://www.omg.org/spec/UML/2.5/Beta1/PDF/ chapter 11.5 Associations)
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