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Just a few snapshots of the custom online pages created for IMED 1341, Interface Design Course.
A Class diagram gives an overview of a system by showing its classes and the relationships among them. UML class notation is a rectangle divided into three parts: class name, attributes, and operations. A navigability arrow on an association shows which direction the association can be traversed or queried. The multiplicity of an association end is the number of possible instances of the class associated with a single instance of the other end.
This small class diagram shows that a university Department can contain lots of other Departments.
The object diagram below instantiates the class diagram, replacing it by a concrete example. A sequence diagram is an interaction diagram that details how operations are carried out -- what messages are sent and when.
Logging in can be factored into four non-overlapping states: Getting SSN, Getting PIN, Validating, and Rejecting.
Activity diagrams can be divided into object swimlanes that determine which object is responsible for which activity. The following deployment diagram shows the relationships among software and hardware components involved in real estate transactions.
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The model abstracts the essential details of the underlying problem from its usually complicated real world. The more complicated the underlying system, the more critical the communication among everyone involved in creating and deploying the software. Anyone interested in learning UML must be familiar with the underlying tenet of object-oriented problem solving -- it all begins with the construction of a model.

A class wraps attributes (data) and behaviors (methods or functions) into a single distinct entity.
New use cases often generate new requirements as the system is analyzed and the design takes shape. Their notational simplicity makes use case diagrams a good way for developers to communicate with clients. The collection of scenarios for a use case may suggest a suite of test cases for those scenarios. Class diagrams are static -- they display what interacts but not what happens when they do interact.
There is an association between two classes if an instance of one class must know about the other in order to perform its work. They are useful for explaining small pieces with complicated relationships, especially recursive relationships. They convey the same information as sequence diagrams, but they focus on object roles instead of the times that messages are sent.
Logging in consists of entering a valid social security number and personal id number, then submitting the information for validation. While in its Validating state, the object does not wait for an outside event to trigger a transition. The fork and the subsequent join of the threads coming out of the fork appear in the diagram as solid bars. The UML modeling tools from Embarcadero Technologies make it easy to create diagrams like the ones in this article plus they provide a great amount of other functionality including model and code synchronization. The Architect edition includes the ability to create language-neutral UML modeling projects. You are to drive past the parking space and back into it bringing the rear of your vehicle as close as possible to the rear of the space without crossing side or rear boundaries marked by cones. In the past decade, the UML has emerged as the software blueprint language for analysts, designers, and programmers alike.
In our example, there can be only one Customer for each Order, but a Customer can have any number of Orders. Class or instance names may be omitted from object diagrams as long as the diagram meaning is still clear. An arrow goes from the sender to the top of the activation bar of the message on the receiver's lifeline.

The asterisk on the self call means iteration (to make sure there is available room for each day of the stay in the hotel).
In a sequence diagram, object roles are the vertices and messages are the connecting links. Messages at the same level (sent during the same call) have the same decimal prefix but suffixes of 1, 2, etc.
A statechart diagram shows the possible states of the object and the transitions that cause a change in state.
While a statechart diagram focuses attention on an object undergoing a process (or on a process as an object), an activity diagram focuses on the flow of activities involved in a single process. A branch and its subsequent merge marking the end of the branch appear in the diagram as hollow diamonds.
All Borland and Borland brands and product names are trademarks or registered trademarks of Borland. The more complicated the building, the more critical the communication between architect and builder. One package depends on another if changes in the other could possibly force changes in the first. The objects involved in the operation are listed from left to right according to when they take part in the message sequence. Blueprints are the standard graphical language that both architects and builders must learn as part of their trade.
The UML gives everyone from business analyst to designer to programmer a common vocabulary to talk about software design.
All other brand and product names may be trademarks or registered trademarks of their respective holders. The connection between actor and use case is a communication association (or communication for short).

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