  Classical model S{Dcl} of the Dirac particle S_D is constructed. S_D is the
dynamic system described by the Dirac equation. For investigation of S_D and
construction of S_{Dcl} one uses a new dynamic method: dynamic disquantization.
This relativistic purely dynamic procedure does not use principles of quantum
mechanics. The obtained classical analog S_{Dcl} is described by a system of
ordinary differential equations, containing the quantum constant as a
parameter. Dynamic equations for S_{Dcl} are determined by the Dirac equation
uniquely. The dynamic system S_{Dcl} has ten degrees of freedom and cannot be a
pointlike particle, because it has an internal structure. Internal degrees of
freedom appears to be described nonrelativistically. One discusses interplay
between the conventional axiomatic methods and the dynamical methods of the
quantum systems investigation. In particular, one discusses the reasons, why
the internal degrees of freedom of the Dirac particle and their nonrelativistic
character were not discovered during eighty years.
