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Systems Analysis: Data Flow Diagrams

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Questions and Answers

What is the minimum number of input data-flows and output data-flows required for a data store?

Two inputs, two outputs

One input, one output (correct)

Multiple inputs, one output

One input, multiple outputs

What is the purpose of a context diagram?

To show data storage only

To show one process, representing the entire system (correct)

To show external entities only

To show multiple processes, not representing the entire system

What is the notation used to show data flows in a data flow diagram?

Only Yourdon

Only Gane & Sarson

Several notations, including Yourdon, De Marco, Gane & Sarson, and SSADM (correct)

Only Unified Modeling Language

What is the process number assigned to the context diagram?

0 (D) Signup and view all the answers

What is the purpose of examining the data flow to or from a data store?

To identify fuzzy areas (D) Signup and view all the answers

What is the purpose of working backward from an output data flow?

To examine the data flow from an entity on the input side (C) Signup and view all the answers

What is the maximum number of processes that can be included in a level?

9 (A) Signup and view all the answers

What is not included in a context diagram?

Data storage (C) Signup and view all the answers

What is the purpose of analyzing a well-defined process?

To understand how a process works (C) Signup and view all the answers

What is an example of an external entity in a data flow diagram?

Mother (C) Signup and view all the answers