Data Sources and Citation Metrics
The 5th edition of the Research.com Best Engineering and Technology Scientists in South Africa Ranking primarily utilizes bibliometric data sourced from OpenAlex and CrossRef, supplemented by multiple other reputable data repositories. These comprehensive databases provide a robust foundation for deriving citation-based metrics that underpin the ranking. The citation and publication data were collected on January 12, 2026, ensuring that the metrics reflect recent and relevant scientific output. A pivotal metric employed in determining a scientist’s standing in the ranking is the D-index (Discipline H-index), which specifically aggregates papers and citations within the examined discipline, thereby providing a focused measure of impact in Engineering and Technology.
Scope of Research and Ranking Criteria
The ranking is grounded in an extensive examination of 279,971 scientist profiles curated from varied bibliometric sources spanning all disciplines, with a particular focus on 24 scientists specializing in Engineering and Technology. To qualify for inclusion in this ranking, a scientist must possess a D-index of at least 30, with a majority of their tier publications concentrated within the field of Engineering and Technology. Additionally, documented awards and significant achievements in this discipline have been considered as supplementary factors enhancing a researcher’s candidacy.
The threshold for the D-index is dynamically adjusted in increments of 10 in accordance with the estimated total number of scholars in each discipline, thereby ensuring that the ranking reliably identifies the top 1% of leading scholars. Furthermore, to maintain disciplinary consistency, only scientists exhibiting a proximity of 30% or less between their general H-index and D-index are considered, ensuring that their influence is primarily within the examined domain.
Verification Practices and Methodological Rigor
Recognizing the limitations inherent in using raw bibliometric data as an absolute measure of scholarly output, the Research.com team has implemented a rigorous manual verification process. Each scientist profile was cross-checked against publications indexed in a wide array of trusted sources to confirm authenticity and relevance. Although the volume of publications in prestigious journals and leading conference proceedings is not a direct factor affecting the final ranking position, it serves as a valuable secondary indicator of a researcher’s contribution and standing within the scientific community.
The ranking position itself is derived using the D-index calculated with data from OpenAlex and CrossRef, the leading and most authoritative bibliometric systems available to the research community. We encourage readers to consult our methodology page for a detailed overview of the processes and standards that inform the creation of this ranking.
Research.com’s Mission and Vision
The creation of this ranking aligns with Research.com’s broader mission to inspire researchers, academic institutions, industry stakeholders, and policymakers worldwide. By illuminating where leading experts are making impactful advances, our ranking facilitates a transparent and accessible way for the global scientific community to recognize and engage with top researchers in specific fields, geographic regions, and academic institutions. We aim to foster an environment of informed collaboration and strategic development based on clear insights into scientific leadership and innovation.
