CHAPTER 05

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Welcome to the course. Chapter Five : Unified Modeling Language - An Introduction. The content is provided under Common Creative License. Chapter Outlines. These are the outlines of the chapter. It begins with the Introduction, then followed by the Nature of UML and then we Identify the Types and Categories of UML. Later on, we discuss the  Functions of UML diagrams. And then we look into the UML Course Highlights.

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And finally, we close the chapter with the Conclusion. Learning Outcomes. By the end of the chapter, students should be able to Describe the nature of UML. Identify the types and categories of UML. Discuss the functions of UML diagrams. Learning Outcome Number one. Describe the nature of UML. The nature of UML. Software practitioners have used modeling languages for a decades to specify.

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visualize, construct and document systems. Unified Modeling Language or a UML is one of those languages. And today UML is the most used standard modeling language for software and systems development. The definitions of unified modeling language. UML stands for Unified Modeling Language. It is an international industry standard graphical notation used for describing, visualizing, constructing and documenting the artifacts of a software system.

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UML is a modeling language, not a programing language. It is used to create top view diagrams of business processes. It is also designed to be non-technical in nature. The figure shows the official logo of UML. The goal and purposes of UML. So what is the main goal of UML? UML is a simple modeling mechanism used to model all possible practical systems in today's complex environment. UML served multiple purposes which include to reason about system behavior, to detect errors and omissions early in the lifecycle, to present proposed designs and communicate with stakeholders, to understand requirements and to drive implementation.

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Learning Outcome number one, the summary. By the end of the chapter, student should be able to describe the nature of UML. In this section, student should be able to discuss the concept of UML and elaborate the goal and purposes of UML. Learning outcome number two. Identify the types and categories of UML. Types of UML diagrams. What are the types of UML diagrams?

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UML comprise of 14 diagrams and diagrams are class diagrams, object diagrams, component diagrams, composite structure diagrams, package diagrams, deployment diagrams, profile diagrams, use case diagrams, activity diagrams, state machine diagrams, sequence diagrams, communication diagrams, timing diagrams and interaction overview diagrams. Categories of UML. As mentioned earlier, there are 14 types of UML diagrams, and these diagrams can be organized into three categories.

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The categories are structural diagrams, behavioral diagrams and interaction diagrams. Structural diagrams depict a state, take elements of an application while behavioral diagrams describe the dynamic functions of a system. And finally, the interaction diagrams show how the system functions over time in conjunction with other systems or uses categories and types of UML. That's why we have discussed earlier. We know that UML can be categorized into three.

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The first category is structure diagram. Second category is behavioral diagram and a category is interaction diagram. We also know that there are 14 types of UML diagrams. Every each of these diagrams will fall under one of the category. The figure shows the summary of the categories and types of UML. Let's begin the first category structure diagram. Structure diagram comprise of class diagram, object diagram, component diagram, composite structure diagram, package diagram, deployment diagram and profile diagram.

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The second category is behavior diagram, comprise of use case diagram, activity diagram and step machine diagram. And the third category, interaction diagram includes sequence diagram, communication diagram, timing diagram and interaction overview diagrams. Learning outcome number two, the summary. At the end of the chapter, students should be able to identify the types and categories of UML. This include to list all the 14 types of UML diagrams and to classify the UML diagrams into three categories.

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Learning outcome number three. Discuss the functions of UML diagrams. Structural diagrams, an overview. UML structural diagrams depict elements of a system that are independent of time and that convey the concepts of a system and how they relate to each other. The UML defines seven types of UML structural diagrams, which includes class diagram, object diagram, component diagram, composite structure diagram, package diagram, deployment diagram and profile diagram. Description of UML Structural Diagrams.

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The following are the brief description of the seven types of structural diagrams. Class Diagram. Class diagram shows a collection of a static model elements such as classes and types, their contents and their relationships. Object Diagram. Object diagram depicts objects and data relationships at a point in time, typically a special case of either a class diagram or a communication diagram.

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Component diagram. Component diagram are used to model higher level or more complex structures, usually build up from one or more classes and providing a well-defined interface. Composite structure diagram. Composite structure diagram reflect the internal collaboration of classes, interfaces and components together with their properties to describe a functionality. Package diagram. Package diagram shows how model elements are organized into packages as well as the dependencies between packages.

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Deployment Diagram. Deployment diagram are used to divide the model into logical containers or packages and describe the interactions between them at the high level. Profile diagram. Profile diagram describes lightweight extension mechanism to the UML by defining custom stereotypes, tagged values and constraints. Behavioral diagram, an overview. UML Behavioral Diagrams depict the elements of a system that are dependent on time and that convey the dynamic concepts of the system and how they relate to each other.

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The UML defines three types of UML behavioral diagrams, which includes use case diagram, activity diagram and state machine diagram. Description of UML Behavioral Diagrams. The following are the brief descriptions of the three types of behavioral diagrams. Use Case Diagram. Use Case Diagram are used to model user or system interactions by defining their behavior requirements and constraints in the form of scripts or scenarios.

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Activity Diagram. Activity Diagram models the behaviors of a system and the way in which these behaviors are related in an overall flow of the system. State machine diagram. State machine diagram illustrates how an element can move between states, classifying its behavior according to transition triggers and constraining guards. Interaction diagrams, an overview. UML Interaction diagrams used to capture the interactive behavior of a system and focus on describing the flow of messages within a system providing context for one or more lifelines within a system.

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UML defines four types of UML interactions diagrams which includes sequence, diagram, timing diagram, communication diagrams and 

interaction overview diagrams. Description of UML Interaction Diagrams. The following are the brief description of the four types of interaction diagrams. Sequence Diagram. Sequence diagram are the structured representations of behavior as a series of sequential steps over time. Timing diagram. Timing Diagram define the behavior of different objects within a time-scale, providing a visual representation of objects, changing state, and interacting over time.

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Interaction overview diagram. Interaction overview diagram visualize the cooperation between interaction diagrams to illustrate a control flow, serving and encompassing purpose. Communication Diagram. Communication diagrams show the interactions between elements at runtime, visualizing into object relationship. Learning outcome number three, the Summary. By the end of this chapter, students should be able to discuss the functions of UML diagrams. In this section, students should be able to briefly explain all the 14 types of UML diagrams in three different categories. UML Course Highlights.

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For the purpose of this course, we are going to highlight only five types of UML diagrams. The diagrams are class diagrams, use case engrams, activity diagrams, state machine diagrams and sequence diagrams. Chapter Conclusion. Unified Modeling Language, UML is an international industry standard graphical notation used for describing, visualizing, constructing and documenting the artifacts of a software system. There are 14 types of UML diagrams and can be grouped into three categories, structural diagram, behavioral diagram and interaction diagram.

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Each types of the UML diagrams provide a visual representation of an aspect of a system. References. These are the list of references for this section. End of chapter five. Thank you.