Systems Analysis And Design

1729 words - 7 pages

Modern Systems Analysis and Design
Third Edition

Jeffrey A. Hoffer Joey F. George Joseph S. Valacich

Chapter 8 Structuring System Requirements: Process Modeling
8.1 8.1

Copyright 2002 Prentice-Hall, Inc.

Learning Objectives
Understand the logical modeling of processes through studying data flow diagrams How to draw data flow diagrams using rules and guidelines How to decompose data flow diagrams into lower-level diagrams Balancing of data flow diagrams
8.2 8.2

Learning Objectives
Explain the differences among four types of DFDs: current physical, current logical, new physical and new logical Discuss the use of data flow diagrams as analysis tools Compare and contrast ...view middle of the document...

8 8.8

Figure 8-2 Comparison of DeMarco & Yourdan and Gane & Sarson DFD symbol sets

8.9 8.9

Data Flow Diagramming Mechanics
Data Flow
Depicts data that are in motion and moving as a unit from one place to another in the system. Drawn as an arrow Select a meaningful name to represent the data

8.10 8.10

Data Flow Diagramming Mechanics
Data Store
Depicts data at rest May represent data in
File folder Computer-based file Notebook

The name of the store as well as the number are recorded in between lines
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Data Flow Diagramming Mechanics
Process
Depicts work or action performed on data so that they are transformed, stored or distributed Number of process as well as name are recorded

8.12 8.12

Data Flow Diagramming Mechanics
Source/Sink
Depicts the origin and/or destination of the data Sometimes referred to as an external entity Drawn as a square symbol Name states what the external agent is Because they are external, many characteristics are not of interest to us
8.13 8.13

Data Flow Diagramming Definitions
Context Diagram
A data flow diagram (DFD) of the scope of an organizational system that shows the system boundaries, external entities that interact with the system and the major information flows between the entities and the system

Level-O Diagram
A data flow diagram (DFD) that represents a system’s major processes, data flows and data stores at a high level of detail
8.14 8.14

Developing DFDs: An Example
Hoosier Burger’s automated food ordering system Context Diagram (Figure 8-4) contains no data stores Next step is to expand the context diagram to show the breakdown of processes (Figure 8-5)
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Figure 8-4 Context diagram of Hoosier Burger’s food ordering system

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Figure 8-5 Level-0 DFD of Hoosier Burger’s food ordering system

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Data Flow Diagramming Rules
Basic rules that apply to all DFDs
Inputs to a process are always different than outputs Objects always have a unique name
In order to keep the diagram uncluttered, you can repeat data stores and sources/sinks on a diagram

8.18 8.18

Data Flow Diagramming Rules
Process
No process can have only outputs (a miracle) No process can have only inputs (black hole) A process has a verb phrase label
8.19 8.19

Data Store
Data cannot be moved directly from one store to another Data cannot move directly from an outside source to a data store Data cannot move directly from a data store to a data sink Data store has a noun phrase label

Data Flow Diagramming Rules
Source/Sink
Data cannot move directly from a source to a sink A source/sink has a noun phrase label Data Flow
A data flow has only one direction of flow between symbols A fork means that exactly the same data goes from a common location to two or more processes, data stores or sources/sinks

8.20 8.20

Data Flow Diagramming Rules
Data Flow (Continued)
L. A join means that exactly the same data comes
from any two or...

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