Week After Spring Break Notes
Week After Spring Break Notes MIS 322
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This 3 page Class Notes was uploaded by Becca Savino on Friday March 27, 2015. The Class Notes belongs to MIS 322 at Washington State University taught by Dr. Saldanha in Winter2015. Since its upload, it has received 71 views. For similar materials see Enterprise Business Process Analysis in Computer Science and Engineering at Washington State University.
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Date Created: 03/27/15
Chapter 7 Data Flow Diagramming DFD Rules Understand the rules of the data ow diagram be able to spot where rules are broken when given a data ow diagram Functional Decomposition process of breaking system descriptions into finer and finer detail Look at the black boxquot then dive into more and more detail Continues until you hit the point where you cannot break the sub process down into more detail or you ve gotten enough detail Primitive DFD is the lowest level 0 First you identify what process you want to break down 0 Identify inputs and outputs I Make sure inputs and outputs remain the same when you go into the next level 0 When you go from one level to the next keep the same naming convention 9 make a new decimal point for each level you Conservation Principle Conserve inputs and outputs at the next level of decomposition Balancing Conserve inputs and outputs when going to the next level diagram Data Flow Splitting data ow at a high level can be separated at the lower levels Guidelines for Drawing DFD s Timing 0 Not represented on a DFD Iterative development 0 Analysts should expect to draw diagram several times before getting a good DFD Primitive DFD s 0 Identify your lowest level of decomposition Rules for stopping decomposition 0 When each process is reduced to a single decision 0 Each data store represents data about a single entity 0 You ve reached the level of detail needed DFD s as Analysis Tools Gap Analysis Helps you identify discrepancies and inefficiencies BPR business process reengineering Significantly changing a business process and reengineering it Need to know for the exam Modeling Logic with Decision Tables Condition stubs that part of a decision table that lists the conditions relevant to the decision Action stubs that part of a decision table that lists the actions that result for a given set of conditions Rules that part of a decision table that specifies which actions are to be followed for a given set of conditions Indifferent condition in a decision table a condition whose value does not affect which actions are taken for two or more rules Procedure Name conditions and values Name all possible actions that could occur List possible rules Define actions for each rule Simplify the table Appendix 7A Definition and Symbols Process work or actions performed on data inside the system Data store data at rest inside the system Sourcesink external entity that is origin or destination of data outside the system Data ow arrows depicting movement of data Use Cases Use case Tries to give you different views of system behaviors how systems respond to different users 0 Represented by Ellipse Actor a role not an individual External entity that acts interacts with the system mostly user roles but can represent a user 0 Represented by stick figures System Boundary Includes all the relevant use cases 0 Represented as a box I Use cases are within the boundary I Actors are outside the boundary Use Case diagram a picture showing the system behavior and the key actors in the system Abstract Use case The use case will not be executed until initiated by another use case Written Use Cases Document details are written not drawn out Level of Use Case 5 suggested levels White As seen from clouds Kite Birdseye viewquot Blue Sealevel view Fish Below Sea Level Black Bottom of the sea
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