  The formalism for extracting the CKM parameter $V_{cd}$ from $\nu N$
production of charm is discussed in some detail. The various model assumptions
needed are clearly pointed out. A direct determination from neutrino induced
dimuon production requires $\nu N$ charm production data, $% \nu N$ charm
hadronization data, and the semi-muonic branching ratios for charmed hadrons.
Hadronization data from FNAL E531 is re-analyzed to take advantage of
better-determined properties of the charmed hadrons. A small bias in the
original published result is removed. Neutrino induced charm fragmentation is
compared to $e^{+}e^{-}$ charm fragmentation functions; the data are consistent
with a common hadronization scheme. An updated value of the mean semi-muonic
branching ratio for charmed hadrons produced in $\nu N$ scattering for $E_\nu
>30$ GeV is obtained. This value is used to determine $% V_{cd}$ and its
associated uncertainties. Prospects for improving the $% V_{cd} $ measurement
to test the unitarity limit of the CKM matrix are described.
