1. A method, comprising: performing, by a computer: associating one or more participating actions with a success event; wherein each of the one or more participating actions comprises a user action on a network-based content site; determining a historical influence score for each of the one or more participating actions based on a previously measured metric associating the one or more participating actions with previous instances of the success event; and assigning a current success influence score to each of the one or more participating actions based on the respective participating action's historical influence score as a proportion of a total of the historical influence scores of the one or more participating actions.