1. Aquello que dirige o encamina.

2. Tratado en que se dan preceptos para encaminar o dirigir en cosas, ya espirituales o abstractas, ya puramente mecánicas. "Guía de pecadores. Guía del agricultor."

3. Lista impresa de datos o noticias referentes a determinada materia. "Guía del viajero. Guía de ferrocarriles."

DRAE. Diccionario de la Lengua Española.

La descripción de un modo particular de lograr algo, la cual es menos prescriptiva que un procedimiento. [COBIT:2006]

rules or instructions that are given by an official organization telling you how to do sth, especially sth difficult.

Oxford Advanced Learner's Dictionary.

A description of a particular way of accomplishing something that is less prescriptive than a procedure. [COBIT:2006]

An Information Security Guidelines is a suggested action or recommendation to address an area of the Information Security Policy. A security guideline is not a mandatory action, and no disciplinary action should result from non adoption. However, Information Security Guidelines are considered Best Practice and should be implemented whenever possible.

http://www.passwordnow.com/en/glossary/information-security-guidelines.html