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Use of the (e,e
p) reaction as a
quantitative spectroscopic tool for probing single-particle structure has
always been accompanied by ambiguities in the treatment of the final state
interaction. Polarization observables, particularly those that rigorously
vanish in PWIA, should place much tighter constraints on the FSIs. A
pioneering experiment at MIT/Bates [Ma94a] measured the so-called
fifth structure function 
in the 
C(
,ep) reaction.
Determination of the electron asymmetry requires that the proton be
detected out of the electron scattering plane; this experiment represents
the initial effort in this new and promising direction.