Ch 7: using Data Flow Diagrams

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Presentation transcript:

Ch 7: using Data Flow Diagrams CSCI 252 Ch 7: using Data Flow Diagrams

Data Flow Diagrams (DFD) Analyzing data-oriented systems Inputs Processes outputs Emphasizes system logic

Advantages Freedom from technical commitment (neutral) Clarify systems / subsystems (is this right?) Communicates understanding to users (is this right?) Analysis of systems (is anything missing?)

Conventions (cont) Entity (source / destination: person, dept, machine, business) Arrow (data flow: from->to) Process (transforming) Data store (examination, retrieval, addition)

Conventions: Basic Symbols

Process Naming: Inventory Control System Name reflects whole system Inventory reporting subsystem Name reflects whole subsystem Verify Customer Account Name reflects specific process

Context Diagram

Diagram 0 (parent)

Typical Errors Data flow arrow wrong direction Data store to entity w/o process Incorrect labeling Too many processes (>9 on a sheet) Omitting data flow Unbalanced decomposition (diagrams don’t match)

Bad!

Good!

Logical vs Physical Data Flow

Developing Logical Flow Diagrams Advantages Better communication w/users Stable systems Understanding of business Flexibility and maintenance Identify redundancies

Transitions

CRUD Matrix

Event Response Table

Data Flow Diagrams

Data Flow Diagram

Data Flow Diagram

Use Case and Flow Diagrams

In class example