The EN/ES (English/Español) Editorial Manual offers a comparative study of the grammar, usage, punctuation, and idioms of Spanish (written in English) with those of English (written in Spanish) to help people learn the grammar rules of their second language in their native tongue. Editors and writers may open two separate windows, one with a Spanish grammar topic and the other with its equivalent of English grammar, and compare the rules to distinguish the peculiarities of each language.

References published by the Real Academia Española (RAE) will be used to develop the Spanish grammar section of the EN/ES Editorial Manual because the academy is recognized throughout the Spanish-speaking world. The Diccionario de la lengua española, RAE’s dictionary, and the Diccionario panhispánico de dudas, which provides explanations to doubts of Spanish usage, are free to use on RAE’s website.

The other three references, Nueva Gramática de la lengua española, which offers descriptive interpretations of Spanish grammar, Ortografía de la lengua española, which describes the rules of Spanish orthography, and El Buen uso de español, which offers grammar and orthography rules written in simple language, are only available in print.