Schnotz, W.

design education model system theory research technology level decision approach dimension development id-model university media multimedia layer support information teaching instruction strategy knowledge method spector analysis performance campus-based tennyson strategy decisions duchastel performance support content paper evidence van den akker reigeluth training journal benefit erlbaum scenario campus-based universities result research evidence ict use presentation design models collin process niegemann prescription framework reeve order paradigm englewood cliffs practitioner mahwah technology publications medium question design theory teacher design decisions design theories performance support systems condition practice design experiments track european situation challenge interest akker community comparison change reason