Pre Recorded Lecture Module 4#

Relating use cases#

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Includes invokes a new use case
Extends tries to relate an exception
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In the above example we can see that Rent items extends Sale Items

Derived Attributes#

During analysis step, analyst only records very obvious attributes
During design phase there are more refined attributes that can be derived from another attribute

Interaction Diagram#

Interaction diagrams show relationship between objects, hence we see only objects interacting in the diagram (Anonymous or named objects) and no classes.

Collaboration Diagram#

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- When few messages are involved then we can use a collaboration diagram
- Having many objects then collaboration diagram is a better way to go

Sequence Diagram#

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- When the number of messages are a lot and there is a sequence of messages then it is better to use sequence diagrams.
- Only limitation is that a lot of objects cannot be placed horizontally.