  Single top-quark production, via weak-interaction processes, is an important
test of the standard model, potentially sensitive to new physics. However, it
is becoming known that this measurement is much more challenging at the
Tevatron than originally expected. We reexamine this process and suggest new
methods, using shape variables, that can supplement the methods that have been
discussed previously. In particular, by focusing on correlations and
asymmetries, we can reduce backgrounds substantially without low acceptance for
the signal. Our method also allows for a self-consistency check on the modeling
of the backgrounds. However, at the present time, serious systematic problems
remain, especially concerning the background from W-plus-jets; these must be
studied further by experimentalists and theorists alike.
