1. A method for differential dynamic content delivery, the method comprising: providing a session document for a presentation, wherein the session document includes a session grammar and a session structured document, and the session structured document includes at least one structural element classified with at least one classification identifier; establishing a planned agenda for the presentation, wherein the planned agenda includes planned durations for presentation of structural elements and a planned sequence for presentation of structural elements; selecting from the session document a classified structural element; presenting the selected structural element to a user participant; recording, during the presentation, identities of presented structural elements, durations of presentation of presented structural elements, and sequence of presentation of presented structural elements; and comparing the planned agenda with the recorded identities, durations, and sequence.