How do we use the runway condition assessment matrix?
From the FAA Improves Runway Conditions Reporting article:


  The pilot or dispatcher would then consult the aircraft manufacturer data to determine what kind of stopping performance to expect from the specific airplane they are operating.


The important bit:


  The FAA is advising operators to develop procedures for pilots and dispatchers that address the changes to runway condition reporting procedures.


Here are the corresponding braking coefficients:



From: Takeoff Performance Data for Operations on Contaminated Runways, aimed at manufacturers.