The Spanish Translation of the Week or SPATRA is a collaborative effort to translate worthy Spanish articles on subjects which may not otherwise have been addressed on the English Wikipedia. Anyone, no matter what their level of fluency in Spanish or English, is welcome to add their name to the list of translators and lend a hand.
The ideal selection is one which has reached feature article status at es:Wikipedia:Artículos destacados, but practically speaking can be any article that appears solid, accurate, and free of copyright issues. It is also preferable that there be no English article or only a basic stub.
Be bold in your translations and civil in your interactions with collaborators. If your language skills are less than perfect, someone will happily fix your mistakes; conversely, never hesitate to correct any mistakes you find. As for any Wikipedia article, expansion of the article with appropriate material is also welcome. More guidelines, such as the prohibition against pure machine translation, can be found at Wikipedia:Translation into English.