[OEP] A possible alternative term for fluent

OEPers:

A recent email reminded me of the term "effectivity".  This is the term 
used in manufacturing product engineering for the concept of a model being
"effective" during a certain time frame.  In Product Data Management (PDM)
systems that support this, a different product/process design can be
presented to manufacturing depending on shift or date.  

This seems similar to the idea of fluent as I understand it.   Effectivity
might therefore be a reasonable substitute for the term fluent if OEP 
produces a note on this.

-Evan