Well it SOUNDS like Readiness maybe similar to Mastery in that X Readiness Stats = 1 Readiness Value. and this Readiness Value is then multiplied by a spec specific Coefficient.
As an example (and I'm just making these numbers up) 33 Readiness = 1 Readiness Value. WW coefficient is 8%. That means 33 Readiness = 8% Readiness for WW. However say BM it's 4%, so for them 33 Readiness = 4% Readiness.
WW -
http://wod.wowhead.com/spell=145969
BW -
http://wod.wowhead.com/spell=145967
MW -
http://wod.wowhead.com/spell=145968
I looked up SimC's Spell file, and as indicated, no value is currently being assigned to any of the coefficients.