Scheme Standards

The Scheme programming language (Wikipedia) has been gradually improved and extended through many rounds of standardization, starting from the original 1975 paper, Scheme: An Interpreter for Extended Lambda Calculus, and continuing through R7RS Large, which is still in progress. Many of the standards have been part of a series of reports named following the convention "Revisedn Report on… Scheme," abbreviated "RnRS." There was also an IEEE-ratified standard that is close to R5RS.

Here are links to all the Scheme standards documents: