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A simplified method for estimating the lightning performance of overhead transmission lines has been evaluated, modified to incorporate newly available information on lightning characteristics, checked against existing line performance, and coded as a simple Fortran computer program by the Working Group. This paper provides the basic characteristics of the method, highlights the changes made from its originally published form, and identifies a few remaining limitations. Comparisons with actual line performance are given, together with some general purpose estimating curves. Ongoing studies directed toward further improvements to the method are reviewed. Future updates to this publication are intended.