paired exploratory survey
It’s all of those things, plus one more thing: the senior tester is the one who takes the notes and makes sure that the right areas are touched and right general information comes out. The senior tester is in charge of developing a compelling testing story. The senior tester does that so that his partner can get more engaged in the hunt for vital information. This “hunt” is a kind of play. A delicious dance of curiosity and analysis.