DEVRY CIS 321 Week 4 Milestone 4 Part 1

Posted by admin on December 8, 2017 in Articles

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DATA MADELING Part I (Logical ERD)
The requirements analysis phase answers the question, What does the user need and want from a new system The requirements analysis phase is critical to the success of any new information system! In this milestone we need to identify what information systems requirements need to be defined from the system users perspectives and draw graphical, logical models to document the data requirements for a new and improved system.
Data modeling is a technique for organizing and documenting a system s data. Data modeling is sometimes called database modeling because a data model is usually implemented as a database. Data is viewed as a resource to be shared by as many processes as possible. As a result, data must be organized in a way that is flexible and adaptable to unanticipated business requirements and that is the purpose of data modeling.
In this milestone, you will first discover those entities in the system that are or might be described by data. Then you will define each entity you identify in respect to the business in an Entity Definition Matrix. Then you will do the data model tutorial in doc sharing that will prepare you for doing the logical entity relational diagram (ERD).
Objectives
After completing this milestone, you should be able to:
Understand and perform the techniques for entity discovery.
Define each entity with respect to the business and complete an entity definition matrix.
Perform the necessary data modeling techniques to organize and document the data requirements for the proposed system.
Construct the Context data model (Logical ERD).
Prerequisites
Before starting this milestone, the following topics should be covered:
Data modeling Chapters 8 and 14.
Milestone 1-3 Solutions (provided…