Systems and methods are described by which a serving module of a campaign controller identifies a first version of a model which the campaign controller uses to communicate a first simulated phishing communication to a plurality of users. The campaign controller receives a first response from a first user to the simulated phishing communication and a second response from a second user to the simulated phishing communication and determines that the first and second responses are corresponding, for example are the same or similar. The serving module assigns a first user to a first group of users and a second user to a second group of users and identifies a second version of the model to use for the first user and a third version of the model to use for the second user.