Research your topic process carefully, including doing library research. In addition, observe or perform the process yourself. If that is not possible, consider interviewing people who regularly perform the procedure. In this manner, you will more readily find ways to improve it, or you will be assured that it is the best it can be.
Write your thesis in clear language, in one arguable sentence, once you decide where you stand. All theses are by definition arguable. It's best to boil down your idea to one clear sentence so that the reader isn't confused.
Base your thesis on a recommendation that you will make at the end of the essay. In this case, as you explain the procedure in question, you might also include two or more paragraphs discussing each step's strengths and weaknesses with the idea that you are building a case for improvement. Alternatively, you might argue that the procedure is effective and efficient as is and that decision makers should save their time, money and energy.