Developer IBM Dialects PL/M , XPL , PL/P , PL/C , PL/S , PL/AS , PL/X , PL/8, EPL Influenced by COBOL , Fortran , ALGOL Influenced SP/k , B , REXX , AS/400 Control Language PL/I at Wikibooks PL/I ("Programming Language One", pronounced "pee-el-one") is a procedural , imperative computer