The McKenzie Method teaches the Stoplight Rule, a very useful means of testing and re-testing based on directional preference and repeated loading strategies. However, you can apply this to any treatment strategy you're using.
I often get asked about this and teach it in all of my Modern Manual Therapy Seminars, so I thought I'd make a handy guide for you to refer to.
The "Stoplight Rule" is a key clinical reasoning tool to guide treatment decisions. It uses the patient's symptomatic response to repeated movements to determine if a loading strategy is appropriate.
Before testing, precisely document the patient's symptoms. This is the reference point for all change.
STOP
Distal symptoms are produced and remain worse or peripheralize for > 5 minutes post-testing.
ACTION: Choose a different direction or strategy.
CAUTION
Symptoms temporarily increase or peripheralize, but return to baseline in < 5 minutes post-testing.
ACTION: Proceed cautiously. Ensure you are reaching end-range. Keep loading, as this could still be the directional preference. Monitor closely.
GO
Distal symptoms decrease, abolish, or centralize and remain better.
ACTION: This is the directional preference. Prescribe as a home exercise.