  We define a probabilistic scheme to compute the distributions of periods,
transients and weigths of attraction basins in Kauffman networks. These
quantities are obtained in the framework of the annealed approximation, first
introduced by Derrida and Pomeau. Numerical results are in good agreement with
the computed values of the exponents of average periods, but show also some
interesting features which can not be explained whithin the annealed
approximation.
