From Cheryl Best in the Question Formulation Technique group:
This is an introduction lesson plan to use with 4-8 grade to learn the QFT process and find the value of this process. Students will be examining shoes.
Free to Use and Reuse: Shoes | Free to Use and Reuse Sets | Library of Congress (loc.gov)
That is a great primary source set!
One of my favorite shoe pictures is this one: https://www.loc.gov/pictures/resource/hec.39495/
I've been thinking about how I might use it in a STEM classroom, and I think the QFT process would be a great way to start.