Modula

Modula is an imperative, structured programming language with static, strong and safe typing, designed by Niklaus Wirth at ETH Zurich in Switzerland during the mid 1970s. It first appeared in 1975, with its formal definition published in Wirth's 1976 report titled Modula, A Language for Modular Multiprogramming. Modula's main advance over Wirth's earlier language Pascal was a module system, which let related declarations be organized into cohesive, separately compilable units rather than existing as one undivided program text. Development of Modula itself ceased shortly after its publication, and Wirth redirected his work into a successor, Modula-2, released in 1978, which became the language's primary continuation. Later derivatives building on this line include Modula-2+ from 1984 and Modula-3 from 1988.