Explain the difference between trigger and precondition. What ...

[evelyn o bentley]

Explain the difference between trigger and precondition.
 
  What will be an ideal response?

Question 2

The process of abstraction involves selecting certain characteristics and/or certain behaviors and casting off what does not concern us.
 
  Indicate whether the statement is true or false

[trog]

Answer to Question 1

A trigger is the event that starts the use case. A precondition defines the state of the system before a use case can start. The trigger occurs, or can occur, only if the preconditions to the use case are met. A use case may have more than one trigger.

Answer to Question 2

TRUE

[evelyn o bentley]

Wow, this really help

[Liddy]

YES! Correct, THANKS for helping me on my review