I have never seen two roles in a association relationship in a UML diagram. Is the following appropriate notation, or is there another method of listing two roles?
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Your diagrams says that Course has a property named 1 teaches of type Instructor. And Instructor has a property has a * of type Course.
I guess that the 1 and * are multiplicities and they should be placed a bit apart from role names to distinguish them. The remaining role names should rather correspond to what the properties represent. So where currently you see 1 teaches it should be teacher and on the other side there should be classes (both with the multiplicities offset).
qwerty_so
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Does every binary association require 2 multiplicities and 2 roles? – Peter Tao Mar 25 '17 at 16:06
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1Not necessarily. In case you have navigability (your other question) you would eventually have only one role. – qwerty_so Mar 25 '17 at 16:59