"The TILE system is the most comprehensive tool available for the massage therapist to accurately determine what can and cannot be performed with the client based upon their condition."  The four massage technique classifications (from greatest to least intensity) are Tolerance, Incremental, Light, and Energy.   The TILE system was developed by Bryan Born, DC and is explained more fully at the following sites:

T.I.L.E. System Techniques and Explanation by Bryan Born, DC - http://www.conceptsborn.com/TILE-System.pdf (Source of quote above)

Fundamentals of New Client Intake by Bryan Born, DC -http://www.amtamassage.org/journal/fall07_journal/ce-course.pdf