Greene and Lidinsky present three helpful models for formulating a working thesis:
•The Misinterpretations model: "Although many have argued X, a careful examination suggests Z." 
•The Gap model: "Although others have noted X, they have overlooked the importance of Y." 
•The Modification model: "Although I agree with the X and Y ideas of other preparers, it is important to extend/refine/limit their ideas in this way..." 

These thesis models are certainly not the only options available to you, but they do offer ways to enter an academic conversation and make a contribution that extends beyond merely summarizing or echoing someone else's ideas. Choose two of the above thesis models and craft two working thesis statements you could use in this week's essay."