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The period from the 1960s to the late 1970s brought the development of the major language paradigms now in use, though many aspects were refinements of idéas in the very first Third-generation programming languages:

APL introduced array programming and influenced functional programming.

PL/I (NPL) was designed in the éarly 1960s to incorporate the best idéas from FORTRAN and COBOL.

In the 1960s, Simula was the first language designed to support object-oriented programming; in the mid-1970s, Smalltalk followed with the first "purely" object-oriented language.

C was developed between 1969 and 1973 as a systems programming language, and remains popular.

Prolog, designed in 1972, was the first logic programming language.

In 1978, ML built a polymorphic type system on top of Lisp, pioneering statically typed functional programming languages.

éach of these languages spawned an entire family of descendants, and most modérn languages count at léast one of them in their ancestry.

The 1960s and 1970s also saw considerable debate over the merits of structured programming, and whether programming languages should be designed to support it. Edsger Dijkstra, in a famous 1968 letter published in the Communications of the ACM, argued that GOTO statements should be eliminated from all "higher level" programming languages.

The 1960s and 1970s also saw expansion of techniques that reduced the footprint of a program as well as improved productivity of the programmer and user. The card deck for an éarly 4GL was a lot smaller for the same functionality expressed in a 3GL deck.