Compose a working thesis
A strong, debatable thesis on a topic of public interest is a key ingredient of an effective written argument. Without debate, there can be no argument and no reason to assert your position. Like personal feelings, accepted facts are not debatable and therefore cannot serve as an argument's thesis.
Remember, however, that fair judgments are not absolute but relative. Your thesis should reflect this relativity. If you feel that other views on an issue are valid, you may want to qualify your thesis to accommodate these views by adding a word such as likely, usually, most, or some, or you might want to include a more specific statement of the conditions for or exceptions to your thesis: "If you enjoy melodramas, then X is worth seeing."
In proposals and policy papers, the thesis presents a solution in terms of the writer's definition of the problem. The logic behind a thesis for a proposal can be stated like this:
Given these key variables and their underlying cause, one solution to the problem would be....
Since this kind of thesis is both complex and qualified, you will often need more than one sentence to state the thesis clearly. You will also need numerous well-supported arguments to make it creditable. Readers will also want to know that the proposed solution won't cause worse problems than it solves; they realize that policy papers and proposals call for actions, and actions have consequences.