The teacher can sit at the back of the room and assess the presentation according to agreed criteria. When a student creates an information product for the purpose of providing knowledge to others, the student is engaging in some high powered learning. They are actively involved in constructing their learning, they are teaching by providing information for others and they are motivated by having a potential global audience. The arguments of motivation, the development of group dynamics and ease of assessment, as described in the section above, are similarly applicable to this form of communicating knowledge. Apart from text based communication, human beings are capable of communicating in more visual media.
Visual media can enhance student learning significantly.
A picture is worth a thousand words. Last year I had a year 8 science class undertaking a design exercise with little enthusiasm initially. The object of the exercise was to design a water filtration and reticulation system for an artificial environment. One student, who had a good command of the drawing tools in Word 7.0, produced an excellent presentation of an average design. I asked the student to plug his notebook in to the monitor and explain his design to the rest of the class.