Assignment 2: Creating a Use Case

Use case for CSMS marketing subsystem

(RMO CSMS Marketing Subsystem)
Overview of Diagram
The overview of usage requirement of any system is very important and a use case diagram plays an important role as it can be used to present the system clearly to the top management. Use case diagram consists of several use cases and the actors. Several elements of use cases are as follows:

Use Cases
Use cases depict the sequence of actions or steps that are taken place in the system by several actors to achieve a goal. Margaret Rouse stated, “A use case contains all system activities that have significance to the users. A use case can be thought of as a collection of possible scenarios related to a particular goal.” In the case of RMO CSMS Marketing Subsystem, several different use cases include: * Add/update product information: This use case allows the users have the ability to add and update the information about different products. * Add/update accessory package: This use case allows users to add and update any accessory package. * Add/update promotion: This use case allows the users to be able to add and update the promotion. * Add/update business partner link: This use case allows the users to be able to add and update business partner links.
Actors
Actors interact with the system and these can be external system, any organization, or any individual. These can be represented as a stick figure. In case of RMO CSMS Marketing Subsystem, several different actors include the following: * Marketing. And * Merchandising.
In the use case diagram, actors interact with the use cases through a link which is known as association (Elements of a Use Case Diagram). The association is represented with the help of a solid line between the actors and the use cases (UML 2 Use Case Diagrams: An Agile Introduction).
According to the text in www.e-education.psu.edu, an actor portrays any entity that perform certain roles in a given system. The different roles the actor represents are the actual business roles of users in a given system. Actors are the individuals that interact with the system, so that the use goals can be accomplished. In order to specify the role of a user, actor plays an important role in any system. In RMO CSMS Marketing Subsystem, there are two actors and they are: * Marketing, and * Merchandising.
Using association links, the marketing actor interact with add/update product information, add/update promotion, and add/update business partner link use cases. The merchandising actor interacts with add/update product information, and add/update accessory package use cases. The actors can interact with only those use cases; to which they have an association link. Likewise, in RMO CSMS Marketing Subsystem, actor marketing has an association links to add/update product information, add/update promotion, add/update business partner link and the merchandising actor has an association links to add/update product information, and add/update accessory packages.
System boundary A system boundary defines the scope of what a system will be. A system cannot have infinite functionality. There are limits to every system and they are defined by the use of system boundaries. The system boundary is usually shown as a rectangle spanning all othe use cases in the system. (www.e-education.psu.edu) As for RMO CSMS Marketing subsystem they have not defined the system boundary.

References
Elements of a Use Case Diagram. (n.d.). Retrieved October 25, 2015, from https://www.e-education.psu.edu: https://www.e-education.psu.edu/geog468/l8_p4.html
UML 2 Use Case Diagrams: An Agile Introduction. (n.d.). Retrieved October 27, 2015, from http://www.agilemodeling.com: http://www.agilemodeling.com/artifacts/useCaseDiagram.htm http://searchsoftwarequality.techtarget.com/definition/use-case https://www.e-education.psu.edu/geog468/l8_p4.html