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+At this point we have our classes, our attributes,
+
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+what we're missing is the operations for the class.
+
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+Let me remind you that operations represent the behavior
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+of a class, and that they may be found by
+
+5
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+examining interactions among entities in the description of my
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+6
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+system. So once more, let's bring back our description, and
+
+7
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+let's in this case focus on this specific item.
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+That says that the students may use the system to
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+9
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+add courses. So this is clearly indicating an action
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+that the students should be able to perform. But notice
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+that this doesn't mean that this is an operation that
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+should be provided by the student's class. It rather means
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+that there should be, somewhere in the system, the possibility
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+of performing this operation. So let's see what this means
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+for our example. This might mean, for example, if we
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+focus on the RegistrationManager, so that there should be an
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+operation in the RegistrationManager that allows me to add
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+a student to a course. And this, in turn, means
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+that both Course and CourseOffering should provide a way to
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+add a student. And therefore, I add this corresponding operation
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+to the RegistrationManager, to the Course, and to the CourseOffering.
+
+22
+00:01:07,790 --> 00:01:10,020
+So after doing that we will continue and populate in
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+a similar way, the other classes in the system. So
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+let me recap. Now we saw how to identify classes.
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+How to identify members of the classes, and
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+particular attributes, and operations. There is one thing that
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+we're missing, a very important aspect of the
+
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+class diagram which is the relationships between these classes.