Abstract: A method for delivering a context-based study to a panel in order to measure the effectiveness of advertisements is provided. One disclosed method may include receiving a study definition from a study generation device, the study definition including panel criteria and a target context, and selecting a panel of panelist candidates by matching the panel criteria with panelist candidate demographic information. The method may include monitoring browser events via a study client browser extension of a panelist computing device in order to determine when a target context has been met. The method may further include sending a report indicating that the target context has been met.