This is a problem oriented instead of a method oriented procedure. Each day the newest results are written on the blackboard, what went wrong, how errors can be avoided, and how the hypotheses can be tested critically by experiments. New experiments and controls to test the hypotheses are proposed. It is always advisable to use the simplest system, which does still show the characteristics one is interested in. It is more important to ask which experiment disproofs a hypothesis than to ask how to proof it.
Scientific work is comparable with the work of a detective in solving a crime.
By observation or by oral or written information he is confronted with a problem. If, for instance, in our game out of four differently coloured pins none is correct, we know that only one or two of the remaining colours had been set. Disproofing the hypotheses is a better strategy as compared to proofing. Use the method of multiple hypotheses in trying to solve the case.