A study on the experimental Center Group 2 samples are measured before and after an experiment (Quasi – Experimental, design pretest-posttest two-group) for groups of the population are as follows: Students in grade 2 school in education area offices affiliated secondary school Bangkok. The calculated sample size effect (effect size) of a research center similar trials (7) Using the formula of calculation of Glass (12). the trial group and a group of 32 people each group compared with randomly selected schools, the number of specific schools and 2 simple random lottery with the students as a group in each trial and comparison groups. With the criteria of a sample is the consent to participate in research consent from parents, and there are steps to change behavior in the short term and are weighing scale. For the criteria to qualify from the group, for example, is not voluntarily or refuse to participate in research projects.
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