MILESTONE 5 – PROCESS MODELING – Part II (Exploded DFD) _______________________________________________________ Part 1 Synopsis 1. Level 0 Data flow Diagram T 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. 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 C 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. Objectives After completing this milestone, you should be able to: Create a Level 0 (System) Data Flow Diagram Create a Child Data Flow Diagram Prerequisites Before starting this milestone, the following topics should be covered: • Process Modeling – Chapter 9 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. A ctivities Develop Level 0 DFD. Make assumptions where necessary. Draw one Child Diagram using the Level 0 diagram. 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:_______ ADVANCED OPTIONS Advanced option is to develop Child diagrams for all processes in Level 0 DFD. Child level diagrams:                                                       Due:  __/__/__ Time: _______ Milestone’s Point Value:                                                                ____ Exhibit 5.1 The following is a copy of the transcript of an interview you, a systems analyst from Information Systems Services (ISS), conducted with Oscar Barrett, Janine Peck, and S.P. Marsh of the Equipment Depot. The goal of this interview was to determine requirements for the proposed system. Scene: The Equipment Depot. You have scheduled to meet with the Equipment Depot staff just after the 3:00 PM shift change when Oscar Barrett finishes work and Janine Peck starts her shift. S.P. Marsh, the third shift employee has agreed to come in for the meeting. You:    Well, here we all are again. I promise you I won’t be meeting with you to death. Oscar: That’s OK. We want to help make sure the system does what we need. You:    Good. That is really my goal for this meeting. I want to get consensus on …

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