Abstract
This study examined the effect of educational intervention on ability of self-control. Ten participants in a correspondence upper secondary school took a class about ability of self-control and were asked to engage self-control training that they straighten themselves up for two months. Before and after the training, the participants were asked to indicate intentions of eight types of self-control behaviors. Result indicated that post rating of self-control intention was higher than pre rating of it. Moreover, there found positive correlation between amount of training and increase of self-control intention. These results suggest a possibility that longitudinal training of self-control may be effective in increase of the intentions of self-control behaviors.