3 Years of STACK - An experience report on the implementation and use of formative randomized online tests

We have used STACK in semester-long tests for first-year students, both to reduce procrastination in learning and to provide better support in a mass study program like economics through individualized feedback. Our analysis shows a significant correlation between the results in the tests and exam results. Our results suggest that students appreciate the tests, that they feel better prepared for the exam and would prefer having individualized online tests in all other courses if possible.