Curriculum changes are common in educational institutions, including in polytechnics. This change in curriculum certainly has an impact on changes in the order of courses, syllabus preparation, learning models, and others. One of the affected subjects is the practicum refinement process. This study to see design experiment on dual system class and regular class specially to See the understanding of the concept of practicum of refinement processes. The subjects study were 36 students (18 regular class students and 18 dual system class students) textile program of chemistry major in one of the polytechnics in Bandung. Instruments used in the form of observation, questionnaires, interviews, and test. From the statistical calculations it can be concluded that there is a relationship between the experimental activities and students' understanding of concepts and there are significant differences in understanding of concepts between the regular class and the dual system class after the application of the experimental design is carried out. © Published under licence by IOP Publishing Ltd.
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