What Are The Linkage Between Data Flow, Decision Tables, And Entity-relationship – Essay Example
Topic: What is the linkage between data flow, decision tables, and entity-relationship? Data flow diagrams outline the logical flow of data and information throughout a system in pictorial or graphical arrangement. Additionally, data flow diagrams consist of four symbols that make it useful for discussion and communication among the analysts and the users. In addition, data flow diagrams show how effectively the data is utilized as well as given through procedures within a system (Hoffer, Prescot, & Topi, 2009) and (Smith, 2010).
The entity relationship diagram is used to display the logical parts of a database representation or sub-schema. In addition, an entity relationship diagram defines relationships, entities and attributes. Moreover, an entity relationship diagram is an illustration of what we know about the target system, in terms of essential information, established by joining logical groups of information mutually, along with presenting the rules of the business (associations) through which they are associated (Hoffer, Prescot, & Topi, 2009) and (Smith, 2010).
Decision tables display the logical structure, using all the feasible combinations of conditions as well as consequential actions because it is necessary to consider each possible outcome to ensure that you have ignored nothing. Decision tables have the capability to contain more than two possible results/outcomes (Smith, 2010) and (Hoffer, Prescot, & Topi, 2009).
Now we will discuss the linkage between three modeling techniques (data flow, decision tables, and entity-relationship), we know that during an enterprise modeling, a system analyst definitely uses the graphical models to demonstrate that how well the structures transform data into useful information. In the present scenario end product of an enterprise modeling is a logical model that advocates business processes as well as fulfilling the requirements of the user. At this point modeling tools for enterprise such as data flow, decision tables, and entity-relationship demonstrate that how well the system will work and how well it is structured. The major linkage between these three modeling techniques is a sequence of working relation. This linkage commences from the entity-relationship which describes the main entities and their possible relationships. Then data-flow identifies the critical and most important flow of data and information in the above defined entities and relations. Finally, each functionally primal process is documented with the help of decision tables. In decision table we are also able to explain dissimilar processes which are just possible through above mentioned entity relationships and data flows (Hoffer, Prescot, & Topi, 2009) and (Smith, 2010).
Hoffer, J. A., Prescot, M. B., & Topi, H. (2009). Modern Database Management” Ninth Edition. New York: Pearson.
Smith, L. M. (2010). System Tools and Techniques for Online Auditing in an E-Commerce Environment. Retrieved August 12, 2010, from Texas A&M University: http://acct.tamu.edu/smith/system_tools/systools.htm