The instruments
included: 1) 10 lesson plans under the cooperative learning model (STAD) on the topic of weight measurement,
2) the questionnaire for social skill observation classified into 4 levels, and 3) a test of learning achievement.
The data analysis was done in percentage and means, and analysis of qualitative data was obtained from
observation and action evaluation. For social skill evaluation, it was found that 100% of 36 students and the
overall social skill were at a good level with the mean scores of 3.81, which met the set criteria. For learning
achievement, 100% of the students achieved the mean score of 89.15%, which also passed the set criteria.