ANSI Common Lisp was a response to a perceived threat of an ISO Lisp standard, spearheaded by the developers of EuLisp (which included Jerome Chailloux and Pierre Cointe). It was felt that the European community did not like Common Lisp. According to DARPA, if an ISO standard of Lisp were to succeed, by law DARPA had to use it. Since DARPA was already using Common Lisp, an ISO standard may not be full compatible. An X3 standard was chosen over an IEEE standard due to the fact that X3 is a set of standards committees that focuses on computers and information processing.