BU486 Chapter Notes - Chapter 3: Data Flow Diagram, Business Process, Flowchart

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27 May 2018
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Chapter 3 Systems Documentation Techniques
Data flow diagram (DFD) graphical description of the flow of data within an organization
Processes
Sources and destinations of the data
Data stores
Data source entity that produces or sends the data that is entered into a system
Data destination entity that receives data produced by a system
Data flow movement of data among processes, stores, sources, and destinations
Why Document Systems?
Accountants must be able to read documentation and understand how a system works, e.g. auditors
need this
Sarbanes Oxley act requires management to assess internal controls and auditors to evaluate the
assessment
Used for systems development and changes
Flowcharts describe an information system showing:
Inputs and outputs
Information activities
Data storage
Data flows
Decision steps
Types of flow charts
1. Document flowcharts shows the flow of documents and data for a process, useful for auditors
2. System flowcharts depicts the data processing cycle for a process
3. Program flowcharts illustrates the sequence of logic in the system process
Guidelines for Drawing Flowcharts
Understand the system you are trying to represent
Identify business processes, documents, data flows, and data processing procedures
Organize the flowchart so as it reads from top to bottom and left to right
Clearly label all symbols
Use page connectors
Edit, review, refine to make it easy to read and understand
Business process diagrams (BPD) represents the activities in a business process, users understands the
process from a standard notation, shows the organizational unit performing the activity
Guidelines for Drawing Data Flow Diagrams
Identify and understand the business process
Decide the level of detail (summary or detailed DFD)
Organize diagram using as many rows needed to explain the process
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Document Summary

Data flow diagram (dfd) graphical description of the flow of data within an organization: processes, sources and destinations of the data, data stores. Data source entity that produces or sends the data that is entered into a system. Data destination entity that receives data produced by a system. Data flow movement of data among processes, stores, sources, and destinations. Why document systems: accountants must be able to read documentation and understand how a system works, e. g. auditors need this, sarbanes oxley act requires management to assess internal controls and auditors to evaluate the assessment. Information activities: used for systems development and changes. Flowcharts describe an information system showing: data storage, data flows, decision steps. Business process diagrams (bpd) represents the activities in a business process, users understands the process from a standard notation, shows the organizational unit performing the activity.

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