Expertise
E-E-A-TExpertise is an E-E-A-T component representing an author's professional knowledge in a specific field — signals include academic publications, certifications, citations by experts, industry terminology, and references to studies with sources. As a quick win from audit, it's worth adding min. 3 research citations with years, e.g., '(Smith et al., 2023)'.
Expertise together with other E-E-A-T components makes up 20% of CQS weight. Experts use high-IDF terms, which gives better reranking scores. Expertise connects with Information Density — experts naturally write more densely (more facts per sentence) because they know the topic in depth.
In practice, add author bio with specific qualifications ('Dr Jan Kowalski, 15 years of practice in family law, author of 20 publications') and link to LinkedIn profile. Use industry terminology with high IDF — this signals Expertise to the algorithm, which distinguishes experts from copywriters.