Titles in research articles and doctoral dissertations: cross-disciplinary and cross-generic perspectives

Although titles are often regarded as a minimal aspect of academic discourse, they play a crucial role in knowledge construction across various disciplines and genres. This study examined four features of titles, namely, title length, punctuation usage, structure, and content information, with a corpus comprising 1600 titles of research articles (RAs) from top journals and doctoral dissertations (DDs) from prestigious universities across four soft and hard science disciplines. The results confirm disciplinary and generic variations within the titles of these two critical academic genres. Titles in linguistics and medicine are generally longer than those in economics and computer science (CS). Slightly more titles in hard disciplines contain punctuation than do those in soft disciplines. The average title length of RAs is longer than that of DDs, and more RA titles than DD titles have punctuation in all four disciplines, with no apparent difference in the punctuation variety across the two genres, except for CS titles. Nominal group titles and compound titles are the two most common types, and prepositional phrase titles are the least common in all four disciplines and genres. The content information in titles is different in each discipline and genre. These findings are partially congruent with those of previous studies, indicating the significance of further investigating titles across disciplines and genres.