It is patterned on ESPOL, a similar ALGOL-derived language used by the Burroughs B5000 mainframe systems, which also influenced a number of 1960s languages like PL360 and JOVIAL.
ESPOL, an analogous ALGOL-based language used in Burroughs B5000 mainframes, influenced numerous 1960s languages including PL360 and JOVIAL. This pattern is similar to the design of the target language being described.