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PS-algol is an extension of the ALGOL 60 programming language and part of the family of languages based on it. It was developed in 1966 with input from Per Brinch Hansen, Ole-Johan Dahl, and Kristen Nygaard. PS-ALGOL introduced structured program design through processes and monitors instead of standard control structures like GOTO statements or simple subroutines used in earlier versions of ALGOL. This made it one of the earliest precursors to modern object-oriented programming languages.