The "spray can" test. This is a test paper that gives you a list of processes that must happen to get a spray can full of green paint for example. So the paper may say to get green paint we require a mixture of red, yellow and blue paint. It then goes on to say to get purple paint we require a mixture of blue and red paint etc etc. The next part of the paper says we want green paint but we're getting purple paint in the cans what is the fault? The fault in this instance is there is no yellow paint in the mixture. The questions got progressively harder the further through the booklet you got and I found myself second guessing my answers and wasting time.
