  In this talk we present theoretical evidence that the exclusive/inclusive
ratio of semileptonic Lambda_b-decays exceeds that of semileptonic B-decays,
where the experimental exclusive/inclusive ratio amounts to about 66%. We start
from the observation that the spectator quark model provides a lower bound on
the leading order Isgur-Wise function of the Lambda_b -> Lambda_c transition in
terms of the corresponding B -> D,D^* mesonic Isgur-Wise function. Using
experimental data for the B -> D,D^* mesonic Isgur-Wise functions this bound is
established. Applying a QCD sum rule estimate of the Lambda_b -> Lambda_c
transition form factor which satisfy the spectator quark model bound we predict
the exclusive/inclusive ratio of semileptonic Lambda_b decay rates to lie in a
range between 0.81 and 0.89. We also provide an upper bound on the baryonic
Isgur-Wise function which is determined from the requirement that the exclusive
rate should not exceed the inclusive rate. Our pre-Osaka results are discussed
in the light of new recent preliminary experimental results on the pertinent
mesonic and baryonic form factors presented at the Osaka ICHEP 2000 Conference.
