  Incoherent pion electroproduction on the deuteron is studied from threshold
up to the second resonance region with special emphasis on the influence of
final state interaction, in particular on polarization observables. The
elementary $\gamma N\to\pi N$ amplitude is taken from the MAID-2003 model.
Final state interaction is included by considering complete rescattering in the
final $NN$ and $\pi N$ subsystems. Their influence on the structure functions
governing the semi-exclusive differential cross section, where besides the
scattered electron only the produced pion is detected, is investigated in
detail. For charged pion-production the effect of $NN$-rescattering is moderate
whereas $\pi N$-rescattering is almost negligible, except very close to
threshold. $NN$-rescattering appears much stronger in neutral pion production
for which the primary mechanism is the elimination of a significant spurious
coherent contribution in the impulse approximation. Sizeable effects are also
found in some of the polarization structure functions for beam and/or target
polarizations.
