How can you use DFDs as an analysis tool? What will be an ...

[nramada]

How can you use DFDs as an analysis tool?
 
  What will be an ideal response?

Question 2

In ________ normal form, non-primary key attributes do not depend on each other (what we call no transitive dependencies).
 
  A) First
  B) Fourth
  C) Third
  D) Second

[morganmarie791]

Answer to Question 1

DFDs can also be used in a process called gap analysis. Analysts can use gap analysis to discover discrepancies between two or more sets of DFDs, representing two or more states of an information system, or discrepancies within a single DFD. Once the DFDs are complete, you can examine the details of individual DFDs for such problems as redundant data flows, data that are captured but are not used by the system, and data that are updated identically in more than one location. These problems may not have been evident to members of the analysis team or to other participants in the analysis process when the DFDs were created. Inefficiencies can also be identified by studying DFDs, and there are a wide variety of inefficiencies that might exist. Some inefficiencies relate to violations of DFD drawing rules. Similarly, a set of DFDs that models the current logical system can be compared with DFDs that model the new logical system to better determine which processes systems developers need to add or revise when building the new system.

Answer to Question 2

C