Abstract: The invention relates to continuous gas fluidized bed methods for making a polymer featuring a condensing agent in a recycle stream; and also to methods for monitoring and providing continuity in a gas fluidized bed method for making a polymer featuring a condensing agent in a recycle stream. Certain ranges of &Dgr;&rgr;, in some cases combined with certain ranges of values for An, can be used to find and define desirable operating states, i.e., the “steady state,” “alert state,” “corrective action state,” “continuity impairment state” and/or “&Dgr;&rgr; alarm state,” for the gas fluidized bed reactor polymerization method (where &Dgr;&rgr;, An and the particular states are disclosed herein).