  We present a model for the vector and axial form factors of the transitions
$\overline{B}^0 \to D^{**}$ in good agreement with the presently available data
and based on the present theoretical knowledge, combining a) the safe lattice
QCD predictions at $m_Q=\infty$ and $w=1$ ; b) the predictions at general $w$
of a relativistic, covariant quark model at $m_Q=\infty$, including the well
tested Godfrey and Isgur spectroscopic model and which agrees with lattice QCD
at $w=1$ ; c) the constraint of Bjorken and Neubert relating Semi-leptonic (SL)
and Class I Non-leptonic (NL) decays, which shows that $\overline{B}^0 \to
D_0(2300)^{+} \pi^-$ strongly constrains $\tau_{1/2}(w)$ to be much smaller
than $\tau_{3/2}(w)$, in agreement with the theoretical expectation; d) the
general HQET expansion which constrains the $1/m_Q$ corrections (cf
\cite{LLSW}, denoted hereafter as $LLSW$).
  An important element in the understanding of data is the large contribution
of virtual $D^{(*)}_V$ to the broad structures seen in SL decays at low
$D^{(*)} \pi$ masses - which makes it difficult to isolate the broad resonances
denoted as $D_{1/2}$ in the following.
