All of the major words in the title of a paper, book, article, specification, or other written work for business should be capitalized.
“Major” words to be capitalized in titles include:
• First word
• Last word
• All nouns and pronouns
• All verbs, including short ones (is, are, be)
• All adjectives and adverbs
• Subordinating conjunctions (if, because, as, that)
Do not capitalize the following in titles:
• Articles (a, an, the) other than the first word
• Prepositions with fewer than four letters (on, of, to, by)
• Coordinating conjunctions (and, but, or, for)
If there’s a subtitle, use a colon ( : ) at the end of the main title, and use the same capitalization rules for the subtitle. Capitalize the first word after the colon – even if it is an article, conjunction, or preposition.
Deepwater Drilling in the Gulf of Mexico: The Moratorium’s Effect on Our Industry
The SPE Style Guide says to capitalize all words of four or more letters. It also recommends capitalizing the following short words: No, Nor, Off, Out, So, and Up, as well as those that are part of a verb phrase.
Examples: Held Up, To Inject, Can Be Produced
What about hyphenated words in a title? Do you capitalize the second word after the hyphen? The SPE Style Guide says to capitalize both parts of hyphenated adjectives.
Examples: Two-Phase, In-Situ, Full-Sized