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Conceptual and Object Models

Conceptual and Object Models

Conceptual and Object Models

Respond to the colleagues posts regarding:

“Conceptual and Object Models” Please respond to the following:

• Provide one example of an entity object, association object, agent object, and an event object. Determine which one of these object types closely resembles or mirrors a conceptual object model. Provide a rationale.

• From the e-Activity, examine the key features of a class diagram. Predict whether you would be able to examine a class diagram and point out entities, associations, attributes, and operations. Determine how you would be able to tell them apart.

SPs post states the following:

Provide one example of an entity object, association object, agent object, and an event object. Determine which one of these object types closely resembles or mirrors a conceptual object model. Provide a rationale.

According to Lamsweerde (2009), a conceptual object is characterized as a distinct collection of occurrences of domain-related concepts that are influenced and controlled by the system.  The occurrences in the system share the same features and easily recognizable and can be itemized in any system state.  While this may be true, occurrences may be unique from each other in their own states and transitions.   Integral and absolute characteristics are what sets the occurrences apart.

 

An entity object is a self-sufficient and dormant object where its instances could separately exist in the system.  An example of this is customers and accounts.  The system is interested in capturing this data (Lamsweerde, 2009).

An agent entity is dynamic and self-sufficient whereas its instances carry their own behaviors that are attained by successions of state transitions for the variables it controls (Lamsweerde, 2009).

An association is dependent on other objects that it connects.  It has no owner.  For example, imagine a relationship between a professor and a student.  The professor can be associated with several students (Lamsweerde, 2009).

An event agent is an instantaneous object.  It exists in a single state of the system.  For example, when a button is clicked, it is represented as an object – then the system responds to the event (Lamsweerde, 2009).

From the e-Activity, examine the key features of a class diagram. Predict whether you would be able to examine a class diagram and point out entities, associations, attributes, and operations. Determine how you would be able to tell them apart.

In the video, there is a class name, attribute, and operation.  The name appears in the first partition, the attribute is shown in the second partition, and the operation is in the third partition.  If these class notations are followed it is easy to determine the entities, associations, attributes, and operations.

Reference:

Lamsweerde, A. (2009). Requirements Engineering: From System Goals to UML Models to Software Specifications. John Wiley and Sons, Ltd., Publication.

CIS555 discussion 2 post responses.

Respond to the colleagues posts regarding:

“Building Models” Please respond to the following:

• Suppose you were building an object model for an online banking system. Determine which of the 14 heuristics for building models you would use to build the banking system. Provide a rationale.

• Blackboard is a Web-based learning management system used by Strayer for instructions, online interaction, and for educational assessment. Provide three examples of composite objects that are used in Blackboard. Explain why you believe they are composite objects.

MH’s post states the following:

Suppose you were building an object model for an online banking system. Determine which of the 14 heuristics for building models you would use to build the banking system. Provide a rationale.

I would likely use all the heuristics to build the object model.  Each one is a best practice that, if followed, will allow an analyst to build a high-quality (i.e., complete, correct, and concise) object model.  While I would use all of the techniques outlined by the course text author, I would probably spend the most time applying the following:

• H1: Deriving Objects from the Goal Model

• H2: Deriving Associations from the Goal Model.

• H5: Identifying Attributes.

• H6: Determining Object Types.

• H7: Identifying n-ary Associations.

• H8: Attaching Attributes to Associations.

• H10: Identifying Specializations.

• H11: Identifying Generalizations.

Blackboard is a Web-based learning management system used by Strayer for instructions, online interaction, and for educational assessment. Provide three examples of composite objects that are used in Blackboard. Explain why you believe they are composite objects.

Three examples of composite objects that are used in Blackboard include:

• Assignment and Grades:  A grade cannot exist without an assignment.  If an assignment is deleted from the system, all the grades given for the assignment are also deleted.

• Forum and Discussion Posts:  A discussion post cannot exist apart from a forum.

• Courses and Content: Course content cannot exist separately from a course.  If a course is removed from the system, all the content created for the course exclusively will also be removed.

References

Blackboard. (no date). Manage Discussions. Retrieved from https://help.blackboard.com/Learn/Instructor/Interact/Discussions/Manage

Lamsweerde, A. van. (2009). Requirements engineering: From system goals to UML models to software specifications. West Sussex, England: John Wiley.

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