Chawki Hajjem

Papers

Total Citations

359

H-Index

About

Chawki Hajjem is a pioneering researcher in the field of open access (OA) and its impact on scholarly communication. His key research areas include the growth of open access publishing, citation analysis, and the development of automated methods for identifying OA articles. Hajjem is best known for his landmark 2006 study, which conducted a ten-year cross-disciplinary comparison of the growth of open access and its effect on research citation impact. Analyzing over 1.3 million articles across ten disciplines—including biology, psychology, sociology, and economics—he and his colleagues demonstrated that openly accessible articles receive significantly more citations than those behind paywalls, a finding that has shaped global open access policy and practice. This highly influential work has garnered 356 citations to date. Additionally, Hajjem contributed to methodological rigor in OA research through a 2005 signal-detection analysis evaluating the accuracy of automated OA identification, revealing that such algorithms tend to overestimate OA prevalence. His work remains essential reading for scholars studying the intersection of open science, bibliometrics, and research dissemination.