posttest light shown objective will part experiment teacher very type problem share expertise there people outcome final think knowledge student' 606 cooperation result keyword student wa against analysi learning medan research ability improve between essay power important prior positive peneitian serdang sipahutar course cooperative imagination using critical chosen basi university equip competence target ABSTRACT karya totaling post because vehicle 068 2015 faculty main basic experimental TKR subject model understanding explain thu presented lubuk study influence test refused thitung lubukpakam berpedonam improved clas especially training collection group reasoning accepted field determine kristian data pakam showed engineering skill ttable SMK automotive 2016 drawing technique it aim require one effect material standard palinum pair pretest help