Analysis Result of Product Effectiveness The product effectiveness in improving science process skill in the first test was known by comparing pretest and posttest value. Statistic test used was paired t test by using α = 0,05, the value of significance 0,000. Since the significance value was 0,000 or it was < 0,05 so Ho was rejected. So, by using α = 0,05 it could be concluded that science domain based learning tool which was integrated with local wisdom was effective in improving science process skill of students grade VII of JHS.