  We review here a novel circuit theory of superconductivity. The existed
circuit theory of Andreev reflection has been revised to account for
decoherence between electrons and holes and twofold nature of the distribution
function. The description of arbitrary connectors has been elaborated. In this
way one can cope with the most of the factors that limited applicability of the
old circuit theory. We give a simple example and discuss numerical
implementation of the theory.
