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THE PROGRAMMING LANGUAGE CONCURRENT PASCAL The paper describes a new programming language for structured program- ming of computer operating systems. It extends the sequential programming language Pascal with concurrent programming tools called processes and moni- tors. Part I explains these concepts informally by means of pictures illustrating a hierarchical design of a simple spooling system. Part II uses the same exam- ple to introduce the language notation. The main contribution of Concurrent Pascal is to extend the monitor concept with an explicit hierarchy of access rights to shared data structures that can be stated in the program text and checked by a compiler. Since 1972 I have been working on a new programming language for struc-tured programming of computer operating systems. This language is calledConcurrent Pascal. It extends the sequential programming language Pascalwith concurrent programming tools called processes and monitors (Wirth1971; Brinch Hansen 1973; Hoare 1974). This is an informal description of Concurrent Pascal. It uses examples, pictures, and words to bring out the creative aspects of new programmingconcepts without getting into their finer details. I plan to define these con-cepts precisely and introduce a notation for them in later papers.