Good & Bad State Graphs

Good & Bad State Graphs

1. A graph is said to be good or bad state graph based on the kinds of state graphs that are used in s/w test design

2. Principles of judging good or bad

   • 1. Total no of states = product of possibilities that make up the state
   • 2. For every input - exactly one transition
   • 3. For every Transition - one o/p specified o/p-trivial , atleast one o/p - sensible
   • 4. sequence of i/p's that will drive the same system back to same state

3. A state graph must have at least two different input codes.