Which phase od DMAIC is designed to insure that the problem does not reoccur and that new processes can be further improved over time?

Who was the 1st man on the moon and what was the name of the mission? Why don't NASA's Rockets burn up while falling back through earths atmosphere? What makes the sun move across the sky? The planets look smaller than the sun because they are further away? What does blast off mean? What was Helen sharman space rocket called? What experiments are they doing in the ISS? How much money is spent in the nasa each year? Closing paragraph on the moon? What country do the first spaceship? Could the sun explode or burn out? What planet consist large number of moon? What causes the phase of the moon to change? What is Moon's gravitational field strength? What year was Joel Hoekstra born? What will a dying star with mass of our sun become? What is the appromixmate length of time required for one complete revolution of the moon around the earth? Who is the roman god Jupiter's kids? The 3 astronarts who steped on the moon? How far is the sun?

Which phase od DMAIC is designed to insure that the problem does not reoccur and that new processes can be further improved over time?