Unit 7(2)

Question 1

Graphical system model

Answer 1

That shows all main requirements for an IS in one diagram
-Inputs/outputs
-Processes
-Data storage
-Easy to read and understand with minimal training

Question 2

Process

Answer 2

Step-by-step instructions are followed that transform inputs into outputs

Question 3

Data flow

Answer 3

Data flowing from place-to-place,such as an input or output to a process

Question 4

External agent

Answer 4

The source or destination of data outside the system

Question 5

Data store

Answer 5

Data at rest,being stored for later use.Usually corresponds to a data entity on an ERD

Question 6

Real-time link

Answer 6

Communication back n forth between an external agent and a process as the process is executing

Question 7

DFD Fragments

Answer 7

-Created for each event in the event table
-Represent system response to one event within a single process symbol
-Self-contained models
-Focus attention on single part of system
-Show only data stores required in the use case