In the literature many claims are formulated about what might be accomplished in actual teaching practice when computers are used in a proper and intensive way. Therefore, in this study we analyse how three leading schools in the lower general secondary education sector in The Netherlands are using computers in their curriculum. The results show that these schools have hardly passed the stage of grassroot developments. To validate and possibly generalize these results we did, as a follow up study, a telephone survey with a larger group of leading schools. The survey confirmed the outcomes of the case studies.