  The various four-fermion production channels in $e^+ e^-$ annihilation are
discussed and the {\tt CC11} process $e^+ e^- \rightarrow {\bar f}_1^u f_1^d
f^u_2 {\bar f}_2^d$, {\mbox{$f$$\neq$$e$}}, is studied in detail. The cross
section $d^2\sigma/ds_1ds_2$, with $s_1,s_2$ being the invariant masses squared
of the two fermion pairs, may be expressed by six generic functions. All but
one may be found in the literature. The cross section, including initial state
radiation and the Coulomb correction, is discussed and compared with other
calculations from low energies up to $\sqrt{s}$ = 2 ~TeV.
