Reference: Tella, S. 1997. Multidimensionality of Media Education Tools. In Tella, S. (ed.) Media nykypäivän koulutuksessa. (Media in Today's Education.) Proceedings of a Subject-Didactic Symposium in Helsinki on Feb. 14, 1997. Department of Teacher Education. University of Helsinki. Research Report 178, 23-31. (Figure is on page 24.)