Deming cycle, creative problem-solving process, and DMAIC organizational improvement methodologies

Have read and reflected on different improvement methodologies, such as the Deming cycle, creative problem-solving process, and DMAIC. As well have learned the key principles of the Six Sigma philosophy. You can choose any organization.
In the discussion post,

Please compare and contrast these different approaches to improving processes.
Explain the relative strengths and weaknesses of each.
Discuss how these approaches are utilized within an organization if they are, and how they could be improved.