From The Free On-line Dictionary of Computing (19 January 2023):
RAISE Specification Language
RSL
<language> (RSL) (RAISE = Rigorous Approach to Industrial
Software Engineering). A wide-spectrum specification and
design language developed by ESPRIT Project 315 at CRI
A/S, Denmark. Systems may be modular, concurrent and
nondeterministic. Specifications may be applicative or
imperative, explicit or implicit, abstract or concrete.
["The RAISE Specification Language", RAISE Language Group, P-H
1992, ISBN 0-13-752833-7].
(2007-10-02)