DEVRY CIS 321 Week 3 Milestone 3 .pdf
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DEVRY CIS 321 Week 3 Milestone 3
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PROCESS MODELING- Part I Synopsis
The 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’
The Data flow diagram (DFD) has gained popularity as a technique for expressing
system requirements for two reasons:
• It facilitates development, which often leads to building systems that better satisfy
• Data flow diagrams and narratives are easy for users to understand.
In this milestone you will first uncover external agents, processes and data flows that
define the requirements for the proposed system and document that information.
You will use that to build the Context Data Flow Diagrams.
After completing this milestone, you should be able to:
• Understand and perform the techniques for requirements discovery.
• Determine external agents (external entities) and their relationship with the
System, identify data flows.
• Construct the Context DFD using VISIO.
Before starting this milestone, the following topics should be covered:
• The problem analysis phase — Chapters 3 and 5
• PIECES framework — Chapters 3 and 5
• Problem analysis techniques — Chapter 6
• Process modeling techniques — Chapter 9
Now that we have studied the current system and analyzed some of its problems and
opportunities, plus gained approval to proceed, we can now start to identify the
business requirements for the system and model them. In this assignment we will
use our results of the previous Milestone. The results of this activity will identify the
system requirements for the proposed system.
Refer to sample forms (below), and results from Milestones 1 and 2 for the
information necessary to complete the activities.
Identify External entities and relationship with system
Identify data flows
Prepare Context level Data Flow Diagram
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 3”.
• Transcripts of Interview - Exhibit 3.1 (see below)
Context level DFD:
For the advanced option, compile the process description to note processes’ input