The Uniform Determinate Sentencing Act of 1976 was a bill signed into law by Governor Jerry Brown to changes sentencing requirements in the California Penal Code. The act converted most sentences from an "indeterminate" sentence length at the discretion of the parole board to a "determinate" sentence length specified by the state legislature. The act was one of the largest drivers in a ninefold increase in California's prison population in the two decades after the act passed.