This classic textbook by Eberhard Sturm is the only up-to-date PL/I currently available in the English language which shows the range of the new PL/I on the computer platforms OS/2, Windows, AIX and z/OS - the basis being the new PL/I compiler from IBM. The language was extended by the package concept, abstract data types, attributes to communicate with C programs and more than a hundred BUILTIN functions. The book provides the basis for certification as an IBM Certified PL/I Programmer/Developer.