From b2d80610db6beda38573890ed169815e495bc663 Mon Sep 17 00:00:00 2001
From: Nguyễn Gia Phong <mcsinyx@disroot.org>
Date: Sun, 24 May 2020 16:34:31 +0700
Subject: [usth/ICT2.7] Engineer software

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+Now, let's look at use cases in a little more detail.
+
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+And start by defining exactly what an actor is. An actor
+
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+represents an entity, which can be a human or a device,
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+that plays a role within my system, so that interacts with my
+
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+system. It's some entity from the outside world, with respect to
+
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+my system, that interacts with my system. It is important to
+
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+clarify that an entity can play more than one role. For
+
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+example, you might have somebody working in a bank that can be
+
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+both an employee of the bank, or a customer of
+
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+the bank, depending on how it interacts with the banking
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+system. And, obviously, more than one entity can play the
+
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+same role. Using the same example, we can have both an
+
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+employee of the bank and just a regular customer, playing
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+the role of the customer. So again, it all depends on
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+what the entity does, how the entity interacts with the
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+system, what kind of functionality of the system the entity uses.
+
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+And finally, actors may appear in more than one use case.
+
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+So it's fairly normal for the same actor to interact with
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+the system in different ways. And therefore, to appear in more
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+than one use case. Just think about the use cases in
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+scenarios of usage. If the same actor can interact with the
+
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+system in different ways, that actor will appear in multiple use
+
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+cases. Now let's go back to the description of our course
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+management system, and see how we can identify actors in the system.
+
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+And as we did for the class diagram before, I encourage
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+you to stop the video and try to identify the actors
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+in the system yourself, before I do it.
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+If we look at the description, we can see that, for example, the Registration
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+Manager is clearly an actor for the system. Students are actors
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+for the system. Professors are actors for the system. And notice
+
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+that we're not doing the same thing that we were doing
+
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+when identifying classes. Here we're identifying
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+entities that are from the outside
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+world, and have an active role in interacting with my
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+system. Again, Registration Manager, that we will just call registrar for
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+simplicity, students, and professors. So once we have identified the
+
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+actors for our example, we can simply draw them, using the
+
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+notation that we just introduced. So we have the registrar,
+
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+and notice how for every actor we clarify the role that
+
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+the actor plays. We have the professor, and we have
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+the student. So here, these are the three actors that we
+
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+identified for our system.
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