vu mgt411 Mid Term Subjective Solved Past Paper No.3

The pages of a website can usually be accessed from a simple Uniform Resource Locator (URL) called the homepage. The URLs of the pages organize them into a hierarchy, although hyper linking between them conveys the reader's perceived site structure and guides the reader's navigation of the sit

--or--

For a web user it is a first page displayed when a user starts a web browser and for a web developer it is a first page when a user selects a site.

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Architecture faces towards strategy, structure and purpose, towards the abstract while Design faces towards implementation and practice, towards the concrete.

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The purposes of interaction diagrams are to visualize the interactive behaviour of the system. Now visualizing interaction is a difficult task. So the solution is to use different types of models to capture the different aspects of the interaction.

That is why sequence and collaboration diagrams are used to capture dynamic nature but from a different angle.

So the purposes of interaction diagram can be describes as:

1. To capture dynamic behaviour of a system.
2. To describe the message flow in the system.
3. To describe structural organization of the objects.
4. To describe interaction among objects.

It is important to understand that the diagrams are meant to make things clear. Therefore, in order to keep them simple, special attentions should be paid to the conditional logic. If it is simple then there is no harm in adding it to the diagram. On the other hand if the logic is complex then we should draw separate diagrams like flow charts. (Page 110)

The subsystem layer

Contains a representation of each of the subsystems that enable the software to achieve its customers defined requirements and to implement the technical infrastructure that supports customer requirements.

The class and object layer

Contains the class hierarchies that enable the system to be created using generalization and increasingly more targeted specializations. The layer also contains design representations for each object.

The message layer

Contains the details that enable each object to communicate with its collaborators. This layer establishes the external and internal interfaces for the system

The responsibility layer

Contains the data structures and algorithmic design for all attributes and operations for each object.

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That is, we can reduce the coupling of a system by minimizing the number of messages in the protocol of a class. (Page 113)