Although the implications of leadership practices in quality management may seem fairly narrow at first glance, it's not narrow enough in and of itself to qualify as a dissertation topic. Dissertations have to research and prove something new, unique and relevant. You'll need to decide specifically what you plan to research about leadership practices and their effects. You may want to prove why a particular practice is effective or how current approaches don't hit the mark. There has to be a theory behind it that your research can undeniably clarify.
Once you develop an idea for your dissertation, you'll need to make sure the research is possible. In order to research quality management leadership and its implications, you will likely need access to product manufacturers or companies that set standards for service delivery. Typically, this means getting business leaders to understand your ideas, see their benefits and open their doors. Explore how you can accomplish your goals. There's no point in pitching a dissertation you can't complete.
Background research is essential to ensure you have a properly considered dissertation. Review the full body of research and findings on quality management leadership. Examine all books, articles and electronic publications that discuss how quality management leadership impacts the industry. Not only will you need to cite these in your proposal, but the professors on the dissertation committee will likely ask you to defend your proposal. You must be able to address their questions and concerns confidently through your background research.
Quality management is a complicated field and has applications in a wide variety of industries. Leadership too is complex and has several branches of business study related to it, including human resources, behavioral management, organizational environment, operations management and business policy. The intersection of quality management and leadership has many variables and a large learning curve for someone unfamiliar with it. Possessing a background in this specialty field will contribute significantly to your success. If you have only cursory or theoretical knowledge of the subject, you may want to consider another dissertation topic.