An event monitoring processor includes a processor and at least one memory. The memory stores a cohort member database, and a database of cohort definitions. Each cohort definition defines a respective cohort. The processor is configured to receive a notification identifying a member action initiated by a member of one of the cohorts. The processor is configured to determine, from the cohort definition of the one cohort, a correlation outcome value from a correlation between the member action and an action associated with the one cohort, and to update at least one of the cohort definitions by saving in the cohort definitions database particulars of the member action in association with the at least one of the cohort definition. The processor is configured to save in the cohort member database a member database record identifying the correlation outcome value. The cohort member database is associated with the cohort member.