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# CIS 321 Case Study 'Employee Benefits System (ECS)' MILESTONE 5 - PROCESS MODELING - Part II (Exploded DFD)

Below are the notes of what's listed as the deliverables to do from the Word Document, but with my notes about how we'll approach it (should make it easier than otherwise).

For Part 1, this is what we need to do:

1. Develop Level 0 DFD. Make assumptions where necessary.
2. Draw one Child DFD for one of the processes you have in your Level 0 diagram. This would be a Level 1 Diagram.
3. Continue decomposition of one process up to primitive processes (Level 2, Level 3, etc.) -> Note: We will not do this step ....we will consider the processes modeled in the Level 1 Diagram as "primitive processes".

For Part 2, this is what we need to do:

1. Write the Structured English for one-two primitive processes. Include sequential, decision making and iteration logics. Your instructor will indicate what specific processes to document. -> Note: We will write the structured English for one of the primitive processes from the Level 1 Diagram we created above. The instructions are written as one to two primitive processes, but I'm fine with writing structured english for just one of the primitive processes from the Level 1 DFD

CIS 321 Case Study ‘Employee Benefits System (ECS)’ MILESTONE 5 – PROCESS MODELING - Part II (Exploded DFD) _______________________________________________________ Part 1 Synopsis 1. Level 0 Data flow Diagram he 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. T The Data Flow Diagram (DFD) is a graphical representation of system which shows systems structure and components. The DFD shows how the data transforms in the system, what the source of the input is and what is the destination. Also, the DFD presents data structure and how it’s stored. In this milestone you will explode the Context level DFD to Level 0 DFD to show sub-systems (processes). The Level 0 DFD shows internal data stores and how data flows through the processes. 2. Child diagram definition hild level diagrams show details and are built till needed level of details is reached. First, we show the information system as a single process on the Context diagram. Then, we decompose and show more details until all processes are functional primitives. Not all processes are exploded to the same number of levels- it’s not required to explode all processes to the same level. The main target is to reach the functional primitive which will be translated into units of program code. C Objectives After completing this milestone, you should be able to: 1. Create a Level 0 (System) Data Flow Diagram 2. Create a Child Data Flow Diagram Prerequisites Before starting this milestone, the following topics should be covered: • Process Modeling - Chapter 9
CIS 321 Case Study ‘Employee Benefits System (ECS)’ Assignment As a systems analyst or knowledgeable end-user, you must learn how to draw data flow diagrams to model business process requirements. 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 Context models (Milestone 3) to document business requirements for the new system. You now need to build the Level 0 (System) DFD and corresponding process models. Activities 1. Develop Level 0 DFD. Make assumptions where necessary. 2. Draw one Child Diagram using the Level 0 diagram. 3. Continue decomposition of one process up to primitive processes (Level 2, Level 3, etc.) Deliverable format and software to be used are according to your instructor’s specifications. Deliverables should be neatly packaged in a binder, separated with a tab divider labeled “Milestone 5-Part II”. References • Context Data Flow Diagram Narrative – Exhibit 5.1 Deliverables: Level 0 Data flow Diagram Due:__/__/__ Time:______ Child level diagrams: Due: __/__/__ Time:_______
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