  A new simple method for description of the nucleation process on the wide
class of heterogeneous centers is given. The nucleation occurs on the
heterogeneous centers with different heights of activation barriers. The
distribution of the total number of heterogeneous centers over the activation
barrier heights is supposed to be a smooth continuous function. This
description results in a simple analytical formulas for all main
characteristics of nucleation. Only a simple algebraic equation for the
paramters has to be solved to get concrete results.
