HRM 3440 Lecture Notes - Lecture 35: Data Flow Diagram, Data Modeling, Data Element
23 May 2018
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HRM 3440 Lecture 35 Notes – Activity Modeling and Data Modeling
Introduction
Data Modeling
• Data modeling, first introduced is a commonly accepted approach to modeling
organizational objects and associations that employ both text and graphics.
• How data modeling is employed, however, is governed by the specific systems
development methodology.
• Data modeling is most often accomplished through the use of entity-relationship (ER)
diagrams.
• Recall that an entity is a generalized representation of an object type—such as a class of
people (employee), events (sales), things (desks), or places (city)— and that entities
possess certain attributes.
• Objects can be related to other objects in many ways.
• An entity-relationship diagram, such as the one shown describes a number of objects
and the ways they are associated.
• An ER diagram (or any other modeling tool) cannot by itself fully describe a business
problem or solution because it lacks descriptions of the related activities.
• It is, however, a good place to start because it describes object types and attributes
about which data might need to be collected for processing.
Activity Modeling
• To fully describe a business problem or solution, the related objects, associations, and
activities must be described.
• Activities in this sense are events or items that are necessary to fulfill the business
relationship or that can be associated with the business relationship in a meaningful
way.
• Activity modeling is often accomplished through the use of data-flow diagrams.
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