Six Sigma Fundamentals: A Complete Introduction to the System, Methods, and Tools

Yes, the DMAIC model focuses on appraising quality—it identifies and then tries to "fix" the problem. One may say it is a formal approach to solving problems when they occur. On the other hand, the DCOV model is a proactive approach trying to prevent problems from happening. The DCOV model would give a better return on investment and better customer satisfaction.