The Paper and the Test Tubes
The TTOP problem analyses activity includes having all input from the group being contemporaneously written on flip charts (the Paper) that are spread along the walls of the conference room for all to see. Inclusion of an extensive reality check and evaluation as part of the process represents a form of testing. The "Test Tubes" are therefore the paper.
The Purpose of Knowledge is Prediction and the Purpose of Prediction Is Control
That's the key. The problem is how to insure the attainment of sufficient, accurate and timely knowledge. TTOP does the trick.