Abstract
This research aims to 1) To study the teamwork skills of the students 2) To study the effects of the project STEM education-based learning activities on the students’ satisfaction. The target group was the Glade 11 students of Khon Kaen Wittayayon School. The study was conducted in the first semester of the academic year 2017. The 92 students were selected by purposive sampling. Research instruments included 9 lesson plans STEM approach, Teamwork assessment and satisfaction questionnaire. The result found that 1. The ability of teamwork skills of students who have been provided with the project STEM education-based learning activities was found that to Level 4 include 1) Listening to the opinions of others (125 points) Collaboration (122 points) and the reflection of their knowledge (122 points) all that means the students are attentive Listen to the proposals and ideas of the group members before presenting their ideas. Students can work with other members of the group well and share responsibilities with all team members. Students present or reflect a positive and creative concept. Level 3 include students Participation(116 points) Working behavior (107 points). Level 2 include Leadership (84 points) 2. Satisfaction with project STEM education-based learning activities was high level (4.70 S.D. = 0.2).

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