The purposes of this study were to study the level of student’s opinion toward the factors supporting the student’s self-discipline to study the level of the student’s self-discipline to study the factors related to student’s self-discipline and to study the factors supporting the student’s self-discipline at King Mongkut’s Institute of Technology Ladkrabang. The results of study were found that the student’s opinions towarded the four factors supporting the student’s self-discipline were at high level (X = 4.03) the student’s self-discipline in five aspects was at high level (X = 3.89). Four factors consisting of the student the family the institute and the teacher had positive relations with the student’s self-discipline. The factors about teacher student and family could predict the student’s self-discipline at 0.01 significance level. And 3 factors could predict the student’s self-discipline at 36.9%.

The aim of this study was to examine an effect of self-control on self-discipline of student at Rajamangala University of Technology Phra Nakhon. Study participants were first year business administration students from 5 different classes during 2009 academic year (N = 194) with 51 males and 143 females. During the 7- week experiment students were asked to remind and report themselves regarding their behavior during Monday Wednesday and Friday. Data from questionnaire developed by researcher with r = 0.79 were analyzed with frequency percentages and means of percentages and reported as follow: 1) Student discipline behavior tended to change significantly after 7 weeks of experiment. 2) Six most behaviors occurred during the experiment were follow instructor’s suggestions and guidelines (96.9%) full class attendance and thinking of other rather than themselves (96.5%) instructor expectations (95.9%) being in classes in time (93.5%) and class attention and commitment (92.0%) respectively. On the opposite six least behaviors occurred during 7 weeks experiment are polite conversation (70.1%) using crossover bridge (79.8%) learning and understanding in classes and polite manner (82.2%) proper dress (86.7%) showing respect to parents before leaving and returning their houses (90.8%).