Prepare for the ASQ, IASSC, and other organization's Six Sigma Black Belt Tests with over 800 questions. Detailed explanations on each answer give the test taker a better understanding if they miss the question. Each test is timed, and is labeled with each category for the test. Select number of questions per test to give you all the flexibility you want. Expect to pass the CSSBB if you consistently get over 80% on this app! Best of luck future Six Sigma Black Belt!