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Uncertainties in nucleosynthesis models originating from uncertainties inastrophysical reaction rates were estimated in a Monte Carlo variationprocedure. Thousands of rates were simultaneously varied within individual,temperature-dependent errors to calculate their combined effect on finalabundances. After a presentation of the method, results from application tothree different nucleosynthesis processes are shown: the $\gamma$-process andthe s-process in massive stars, and the main s-process in AGB stars(preliminary results). Thermal excitation of nuclei in the stellar plasma andthe combined action of several reactions increase the final uncertainties abovethe level of the experimental errors. The total uncertainty, on the other hand,remains within a factor of two even in processes involving a large number ofunmeasured rates, with some notable exceptions for nuclides whose production isspread over several stellar layers and for s-process branchings.

Abundance Uncertainties Obtained With the PizBuin Framework For Monte Carlo Reaction Rate Variations