A strong thesis emerges from the thinking, planning, and drafting that you do as you develop your paper. A tentative thesis might not be sufficiently focused, or it might be too broad to develop successfully. Sometimes a subject turns out to be more complex than it first appeared, and the struggle is to find precise wording that does not oversimplify. It is typical for writers to return to their thesis and make revisions to qualify, focus, or sharpen their main point.
Effective thesis statements
Exercise: Introductions
Exercise: Thesis statements 1
Exercise: Thesis statements 2
Related topics:
Revising a thesis that is too factual
Revising a thesis that is too broad
Revising a thesis that is too vague