Editing Command–query separation (section)

==Broader impact on software engineering==
Even beyond the connection with design by contract, CQS is considered by its adherents to have a simplifying effect on a program, making its states (via queries) and state changes (via commands) more comprehensible.{{citation needed|date=December 2014}}

CQS is well-suited to the [[object-oriented programming|object-oriented]] methodology, but can also be applied outside of object-oriented programming.  Since the separation of side effects and return values is not inherently object-oriented, CQS can be profitably applied to any programming paradigm that requires reasoning about side effects.{{citation needed|date=December 2014}}