Thank you for your reply. I am not using New Quizzes yet, but I have found a work-around. It's a little clunky, but it seems to work. On the chance this might be helpful to others:
Each scenario has 5 to 7 steps. I create a module for each scenario (ie Critical Thinking 1, 2, etc.)
Next, I create a 1 question quiz for each step of the scenario and place them, in order, into the module.
Each step / quiz in the scenario has the requirement of a passing grade from the prior quiz,
If a student gets the wrong answer the "Wrong Answer Comment" is displayed. They must then retake the quiz to move further through the module. Each new question contains the original scenario information plus the addition of the information from the correct answer before. By the time they have correctly answered all quizzes the student will have gone through the entire scenario.
As I said, a little Clunky, but it looks like it works.
Again, Thanks & regards,
Stephen