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Research Assistant: For Students: Purpose Statement
This site gives advice on how to write an effective purpose (thesis) statement. The summary is given as answers to four questions: what? why? when? how?.
Lumen Learning
Lumen: Analysis: Analytic Thesis
This lesson focuses on the forming an analytic thesis statement that includes the how, why, and so what of the subject. It also discusses the need to let the thesis develop naturally and be sure that the main claim is reasoned.