Scheme started in the 1970s as an attempt to understand Carl Hewitt's Actor model, for which purpose Steele and … See more

Scheme is primarily a functional programming language. It shares many characteristics with other members of the Lisp programming language family. Scheme's very simple syntax is based on s-expressions, … See more

This subsection documents design decisions that have been taken over the years which have given Scheme a particular character, but are not the direct outcomes of the original design.
Scheme sp… See more

The language is formally defined in the standards R5RS (1998) and R6RS (2007). They describe standard "forms": keywords and accompanying syntax, which provide the control structure of the language, and standard pr… See more

Because of Scheme's minimalism, many common procedures and syntactic forms are not defined by the standard. In order to keep the core language small but facilitate standardization of extensions, the Scheme community … See more