CIS 317 Notes for Exam 2.docx - CIS 317 Notes Chapter...

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CIS 317 Notes Chapter 5 (Process Modeling) Data flow diagrams pg154 o Elements: process, data flow, data store, external entity o External entity: a person, organization, or system that is external to the system o Data flow diagram describes an action (always have verb and noun) o DFD Hierarchy Context diagram Level 0 diagram Level 1 diagram Level 2 diagrams and below o Steps in Building DFD Build context diagram Identify all major processes encompassed by context Create DFD fragments for use case is handled by process Organize DFD fragments into level 0
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