Hi Folks, thanks to the GiNaC library, we developped the kinetic facilities of Ecco - A Compiler for (Electro-)Chemistry. GiNaC enables the support of so called 'generic rate laws' that can be used to model any rate expression for the simulation of chemical and/or electrochemical reaction kinetics. Thanks to you all!! Kai -- http://echempp.sourceforge.net Kai Ludwig Institut für Organische Chemie Auf der Morgenstelle 18 72076 Tübingen Tel.: 07071/29-73049 Mail: kai.ludwig@uni-tuebingen.de