Games that can say something about testing, then. Christmas brought a new one to our house, for my kids, from my Aunty Wendy. It's called Hedbanz and it's a game you probably already know as 20 Questions or Who Am I ? Essentially, each player takes a card and, without looking at its face, places it on a band around their head so that the other players can see it. The player then has a limited time to ask the others yes/no questions about their card, in an attempt to work out what it is. A typical game might go like this: Player: Am I alive? Players: no. Player: Am I manufactured? Players: no. Player: Do you find me in the home? Players: yes. And so on. A skill in the game is asking questions that together partition the space of all things in different ways to narrow down to a specific item. I like playing the game with my kids because it allows me to see their logic at work, and allows me to show them different strategies for getting to an answer. For our an...