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Various notations are used in data modelling. The degree/participation terminology
and the associated degree/blob notation are convenient for explaining the entity-
relationship modelling approach, so they will be used in the next few chapters. The
multiplicity notation has become generally accepted as the standard for object-oriented
modelling, so it will be used in Chapter 20.
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Section 9.2
1. (a) A course may be taught by many lecturers.
A lecturer teaches, at most, one course.
There are other, equally valid, solutions. For example:
A course must be taught by many lecturers.
A lecturer teaches exactly one course. ...