“Data flow diagrams enable you to model how data flow through an information system, the relationships among the data flows, and how data come to be stored at specific locations. Data flow diagrams also show the processes that change or transform data. Because data flow diagrams concentrate on the movement of data between processes, these diagrams are called process models .” (Modern Systems Analysis and Design, 8th ed, Joseph Valacich)
Objectives:
- understand the logical modeling of processes by studying examples of data flow diagrams,
- draw data flow diagrams following specific rules and guidelines that lead to accurate and well-structured process models,
- decompose data flow diagrams into lower-level diagrams,
- balance higher-level and lower-level data flow diagrams,
- use data flow diagrams as a tool to support the analysis of information systems,
- discuss process modeling for electronic commerce applications, and
- use decision tables to represent the logic of choice in conditional statements.
Topics:
From Modern Systems Analysis and Design:
7. Structured System Process Requirements
7.1. Process Modeling
7.1.1. Data Flow Diagraming
7.1.2. Decision Modeling
From CISA:
3.1. System Development Methodologies
SDLC Phases
3.1.1.1. Acquisition
3.1.1.1.1. Design
3.1.1.1.1.1. Structured Techniques
From Secure Software Design:
1.2. Vulnerability Mapping
1.2.1. The Misuse Case
1.2.2. Diagramming Sensitive Dataflows
1.2.3. Data Diagramming and the Trust Boundary
In this unit, plan to:
- Participate in the class discussion thread
- Read the assigned topics in CISA
- Read selected readings from Secure Software Design
- Read chapter 7 in Modern Systems Analysis and Design