"An incoming click is counted either: - for marketing campaigns: via Eulerian tracking parameters added at the end of a destination URL, which are 'read' upon arrival at the destination page by the Eulerian collector tag. - for organic traffic sources: via the referrer, read upon arrival at the destination page by the Eulerian collector tag. If the same user clicks twice in January on an advertising campaign, Eulerian will count +2 incoming clicks. If the same user visits the website twice from an organic traffic source, Eulerian will count +2 incoming clicks. Incoming clicks are accounted for in Eulerian's attribution models."