  A qualification is suggested for the counterfactual reasoning involved in
some aspects of time-symmetric quantum theory (which involves ensembles
selected by both the initial and final states). The qualification is that the
counterfactual reasoning should only apply to times when the quantum system has
been subjected to physical interactions which place it in a ``measurement-ready
condition" for the unperformed experiment on which the counterfactual reasoning
is based. The defining characteristic of a "measurement-ready condition" is
that a quantum system could be found to have the counterfactually ascribed
property without direct physical interaction with the eigenstate corresponding
to that property.
