Fuente: WIPO "tomato" Method, system and computer-readable medium are disclosed for determining an outcome for an electronic transaction over a computer network. An initial proposition is communicated to a user via an initial proposition communication to facilitate the electronic transaction. Additional information associated with the electronic transaction and the initial proposition is gathered by interacting with the user, via a virtual agent. Based on the gathered additional information, the initial proposition is dynamically modified to generate an alternative proposition. The alternative proposition includes generating an alternative engagement strategy based on adjusting of weighting values of a strategy selection model configured to evaluate multiple engagement strategies. The alternative proposition is communicated to the user via an alternative proposition communication. Further, a response to the alternative proposition from the user is received. Based on the response to the alternative proposition, the outcome for the electronic transaction is determined.