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Milestone 6: Process Modeling
 
Synopsis
Process modeling is a technique for organizing and documenting the structure and flow of data through a system’s processes and/or the logic, policies, and procedures to be implemented by a system’s processes. In this milestone we focus on using and constructing data flow diagrams (DFDs) and decomposition diagrams to perform process modeling.
 
Data flow diagrams are tools that depict the flow of data through a system and the work or processing performed by that system. A decomposition diagram is a DFD planning tool that shows the top-down functional decomposition and structure of a system.
 
During this milestone you will first construct a context diagram to establish project scope and boundaries. Secondly, you will draw an event decomposition diagram to partition the system into logical subsystems and/or functions. Thirdly, you will draw event diagrams to model individual processes. Finally you will construct a system data flow diagram that shows the big picture of the system.
 
Objectives
After completing this milestone, you should be able to:
 
·        Construct a context diagram to illustrate a system’s interfaces with its environment.
 
·        Identify external and temporal business events for a system.
 
·        Logically group events to create an event decomposition diagram.
 
·        Create event diagrams.
 
·        Merge event diagrams into a system data flow diagram.
 
Prerequisites
 
The process for this milestone flows from a Context Diagram -> Event Decomposition Diagram -> Event Diagrams.  Lastly, you will construct a System Data Flow Diagram which combines your Event Diagrams.   Data flow diagrams are tools that depict the flow of data through a system and the work or processing performed by that system.
 
Make sure you include Event Diagrams for the following events:
 
·        Search Employee Directory
 
·        Update Employee Profile
 
·        Enter New Employee Profile.
 
Like other assignments, use the diagramming tool you have been using.
 
 
 
Objectives
After completing this milestone, you should be able to:
 
·        Construct a context diagram to illustrate a system’s interfaces with its environment.
 
·        Identify external and temporal business events for a system.
 
·        Logically group events to create an event decomposition diagram.
 
·        Create event diagrams.
 
·        Merge event diagrams into a system data flow diagram.
 
Prerequisites
 
1.    Process modeling – Chapter 9
 
2.    Optional: Solutions for Milestone 1-5
 
Assignment
The preliminary investigation and problem analysis phases of the methodology have been completed and you understand the current system’s strengths, weaknesses, limitations, problems, opportunities, and constraints. You have already built the data model (Milestones 4 and 5) to document business data requirements for the new system. You now need to build the corresponding process models.
 
Activities
1.    If you have not already drawn a Context Diagram in Milestone 2, draw one now based on the meeting transcript in Exhibit 2.1 of Milestone 2 plus the accompanying use-case (event/response) matrix in Exhibit 6.1. Note that not everything in the transcript is related to the Context Diagram.
 
2.    Given the accompanying use-case (event/response) matrix in Exhibit 6.1, draw the Event Decomposition Diagram. For background information on each use case, see the meeting transcript in Exhibit 3.1 of Milestone 3 and Exhibit 4.1 of Milestone 4.
 
3.    Given your decomposition diagram from above and the use-case matrix, draw Event Diagrams. Note: draw event diagrams for the Search Employee Directory; Update Employee Profile; and Enter New Employee Profile.  Use your data model from Milestones 3 and 4 as an attribute reference.  Also, state any assumptions you make.
 
4.    Merge your event diagrams from #3 above into a System Diagram.
 
Delivery format similar to what you have used in the earlier Milestones.
 
References:
·        Completed Solutions from Prior Milestones
 
·        Completed Use-Case (or Event-Response) List – Exhibit 6.1
 
·        Primitive Diagram Narrative – Exhibit 6.2
 
Deliverables
1.    Context Diagram
 
2.    Event Decomposition Diagram
 
3.    Event Diagrams
 
4.    System Data Flow Diagram
 
Prepared by Gary B. Randolph for Systems Analysis & Design Methods 7 ed
by J. L. Whitten, L. D. Bentley, & K. C. Dittman
Copyright Irwin/McGraw-Hill 2007

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