ALGOL 68 – revised 1973[6] – introduced new elements including flexible arrays, slices, parallelism, operator identification, and various extensibility features.
Niklaus Wirth based his own ALGOL W on ALGOL 60 before developing Pascal. Algol-W was intended to be the next generation ALGOL but the ALGOL 68 committee decided on a design that was more complex and advanced rather than a cleaned simplified ALGOL 60. The official ALGOL versions are named after the year they were first published.
Algol 68 is substantially different from Algol 60 but was not well received, so that in general "Algol" means Algol 60 and dialects thereof. Fragments of ALGOL-like syntax are sometimes still used as pseudocode.