  We discuss the quasi-adiabatic approximations to the three-body wavefunction
in breakup processes, clarifying the assumptions underlying the model. This
suggests alternative approximation schemes. Using different theoretical
three-body models, calculated differential cross section angular distributions
for the Be-11(p,d) reaction,for which new preliminary data have been reported
at 35 MeV, are presented. We show that calculations are sensitive to the
inclusion of deuteron breakup and to the breakup model used, particularly if
used to deduce absolute spectroscopic information on the 0{+} and 2{+} Be-10
core state parentages. There is also considerable sensitivity to the model used
in calculations of the relative cross sections to the two states.
