Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Scientific Time Sharing Corporation (STSC) was a pioneering timesharing and consulting service company which offered APL from its datacenter in Bethesda, MD to users in the United States and Europe.Scientific Time Sharing Corporation was formed in 1969 in Bethesda, Maryland with some of the people who originally implemented APL programming language, notably Philip S. Abrams, as a language at IBM. In 1970, STSC released APL PLUS, a version of the APL360 language with many practical extensions oriented toward fostering business usage of APL.