Editing WATFIV (section)

===WATFOR-11, -S and -11S===
In 1974, a compiler with characteristics similar to the IBM implementation was created for the [[Digital Equipment Corporation]] [[PDP-11]] computer and called WATFOR-11. The team members, Jack Schueler, Jim Welch and Terry Wilkinson, were later joined by [[Ian McPhee (computer scientist)|Ian McPhee]] who had added new control statements to the WATFIV compiler for [[structured programming]] (SP). These new statements included the block IF (later included in the ANSI X3.9-1978 language standard), WHILE, UNTIL, and others.  WATFIV-S was announced in 1974 and a few months later, WATFOR-11S (the "S" indicating the new SP features) was also announced.  The original SP features were later enhanced with additional statements by Bruce Hay in WATFIV-S in 1980 and by Jack Schueler in WATFOR-11S in 1981.