« previous next »

Author Question: What do each of the four symbols in a DFD represent? Explain the terms used in describing the ... (Read 97 times)

sjones

  • Hero Member
  • *****
  • Posts: 520
on: Jul 7, 2018
What do each of the four symbols in a DFD represent? Explain the terms used in describing the processes in the DFD.
 
  What will be an ideal response?

Question 2

The most common format used for data modeling is ________ diagramming.
 
  A) Entity-class
  B) Entity-object
  C) Entity-subject
  D) Entity-relationship
Modern Systems Analysis and Design ¦ Valacich, George ¦ 8th Edition
Buy Test-Bank


tsternbergh47

  • Sr. Member
  • ****
  • Posts: 311
Reply #1 on: Jul 7, 2018
Answer to Question 1

DFD symbols consist of four symbols that represent the same things: data flows, data stores, processes, and sources/sinks (or external entities). A data flow can be best understood as data in motion, moving from one place in a system to another. A data flow is data that move together, so it can be composed of many individual pieces of data that are generated at the same time and that flow together to common destinations. A data store is data at rest. A process is the work or actions performed on data so that they are transformed, stored, or distributed. When modeling the data processing of a system, it does not matter whether a process is performed manually or by a computer. Finally, a source/sink is the origin and/or destination of the data.

Answer to Question 2

D


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.

Did you know?

Medications that are definitely not safe to take when breastfeeding include radioactive drugs, antimetabolites, some cancer (chemotherapy) agents, bromocriptine, ergotamine, methotrexate, and cyclosporine.

Did you know?

The use of salicylates dates back 2,500 years to Hippocrates’s recommendation of willow bark (from which a salicylate is derived) as an aid to the pains of childbirth. However, overdosage of salicylates can harm body fluids, electrolytes, the CNS, the GI tract, the ears, the lungs, the blood, the liver, and the kidneys and cause coma or death.

Did you know?

Common abbreviations that cause medication errors include U (unit), mg (milligram), QD (every day), SC (subcutaneous), TIW (three times per week), D/C (discharge or discontinue), HS (at bedtime or "hours of sleep"), cc (cubic centimeters), and AU (each ear).

Did you know?

As many as 28% of hospitalized patients requiring mechanical ventilators to help them breathe (for more than 48 hours) will develop ventilator-associated pneumonia. Current therapy involves intravenous antibiotics, but new antibiotics that can be inhaled (and more directly treat the infection) are being developed.

Although average brain size increases gradually though time in H. erectus, individuals with small br Although average brain size increases gradually though time in H. erectus, individuals with small br
Medical Terms and Corresponding Synonyms Medical Terms and Corresponding Synonyms
Example of a family genogram with accompanying legend (symbols used in genograms). Example of a family genogram with accompanying legend (symbols used in genograms).
Common Abbreviations and Symbols Used by Massage Therapists Cont Common Abbreviations and Symbols Used by Massage Therapists Cont
How to evaluate algebraic terms containing fractional exponents without a calculator (Part 2) How to evaluate algebraic terms containing fractional exponents without a calculator (Part 2)
Some obesity genes in the human genome. The green triangles represent single genes in which obesity Some obesity genes in the human genome. The green triangles represent single genes in which obesity
Video: Lipid digestion - mouth, stomach and small intestine

For a complete list of videos, visit our video library