Summary: This is not a substitute for understanding MI, and for the slower process of understanding your patient and her/his stage of change, and thoughts about change.
But it is a handy addition to that process.
Readiness to Change Scale/Ruler
On a piece of paper, draw a line/ruler and scale it, 0-10.
Explain: zero is not at all ready to change, 10 is completely ready to change. Where are you on that scale? (can be done verbally without the ruler, obviously, but sometimes making things really concrete helps).
Responses (from http://www.adultmeducation.com/AssessmentTools_3.html )
If the person's mark is on the left of center:
If the person's mark is near the center:
If the person's mark is on the right of center: