Some types of cognitive tasks considered to be fulfilled in only one way. In reality, for example, when you ask somebody to count down successively subtracting 7 from 100, one can imagine the row of figures, another can do it by "-10+3", the third one can do the task in column etc. But the result cannot indicate the way of decision-making. Something about cognitive styles could be helpful. Can anyone give me an advice about some effective tests?