This paper reports a class practice through collaborative problem solving in technology and home economics at junior high school. The learning content involved information technology and information security using the knowledge-constructive jigsaw method for two lesson periods. The practice consisted of producing ideas about using robot technology for energy conversion. The integrated knowledge-constructive jigsaw method was practiced over 16 lesson periods. In solving the problem cooperatively, the students effectively acquired knowledge and learned skills related to technology and home economics. The learning process also involved collaborative efforts on the part of the students and acquiring independence of will. Furthermore, a work devised more was produced.