  The ACCMM model predicts the lepton spectrum from $B$ meson decay by assuming
the meson disintegrates into a spectator quark of definite mass and momentum
distribution and an off shell $b$ quark whose decay leptons (boosted into the
rest frame of the meson) determine the lepton spectrum. In this letter, we show
that one can define a model dependent $b$ quark mass so that the spectrum
derived from the ACCMM model agrees very well with the free quark decay
spectrum far from the endpoint. Near the endpoint, there is some disagreement,
indicating the result is more model dependent. The integrated spectra are
however very nearly identical. These results are in accordance with
expectations based on the heavy quark effective theory. The detailed analytic
study of this model helps elucidate the HQET result, and in particular the
meaning of the $b$ quark mass. We conclude that for LEP experiments, free quark
decay might be as general and more simple than the ACCMM ansatz for modeling
the inclusive charged lepton spectrum from $B$ meson decay.
