[en] Development has been undertaken of a general-purpose numerical model (PROTOCOL) for the dissolution reactions of nuclear waste forms in water. It is intended to improve our predictive capability for leach rates by bringing together and applying all the known factors that affect them, including especially chemical properties and processes. PROTOCOL is evolving into an integrated software package. It has been provided with an elevated temperature capability, including an expanded data file and a more sophisticated file manager program. Checkout of PROTOCOL functioning was continued with dissolution exercises for amorphous silica. So far, the results seem very reasonable, and it is concluded that the major functions are working as intended. Predictions of chemical events can be made as a result of the interactions of both kinetic and equilibrium processes. Modeling exercises are in progress with experimental dissolution data. It is expected that this will be very effective in identifying areas where improvements are desirable. An analysis of data on the leaching of natural nepheline as a function of both pH and temperature predicts the formation of several solid prases, especially of aluminous materials. PROTOCOL is still under intensive development, and many extensions are planned or considered. It promises to be a very useful device for the interpretation and extrapolation of leaching data for nuclear waste form materials