These cards by Liz Sanders of MakeTools LLC have just been added to the Tools page, following a fantastic workshop run by Liz for our graduate students!
This looks promising as a toolkit for exploring cultural aspects of design interpretation. Not too much detail yet. Spotted at a paper presentation at IASDR Cincinnati 2017, by Chen Hao of TU Delft.
One of my favorite bits on product testing from one of my favorite shows, Silicon Valley. The clip says it all: You are not your user! The focus group facilitator is priceless.