Is first-class correct use of hyphen?

As with many compound terms, it depends on the usage and placement. In general, if the Words are used as a modifier directly preceding the modified Word, the hyphen is required. Otherwise the hyphen is not used. Examples: * "We use only first-class ingredients." * "Your presentation was first class." Style manuals such as Words into Type and Chicago Book of Stylehave chapters detailing hyphen usage, and they're Excellent references for any writer or student.