Article-level metrics are citation metrics which measure the usage and impact of individual scholarly articles.
Altmetrics "is the creation and study of new metrics based on the Social Web for analyzing, and informing scholarship."
Altmetrics are alternative methods of measurement of scholarly work based on their online presence. Altmetrics track mentions of a work in social media outlets such as Twitter, blog posts, and research networking sites.
Article Influence Score determines the average influence of a journal's articles over the first five years after publication.
The mean Article Influence Score is 1.00. A score greater than 1.00 indicated that each article in the journal has above-average influence. A score less than 1.00 indicates that each article in the journal has a below-average influence.
Note: Article Influence Scores can vary between the Eigenfactor website and Journal Citation Reports. This is because the eigenfactor metrics also measure other resources, such as dissertations and newspaper citations.