Relier Pairs Concrete Operational StageVersion en ligne This crossword puzzle is over key terminology related to Piaget's concrete operational stage. par Jennifer Paris 1 classification 2 decentration 3 seriation 4 identity 5 reversibility 6 conservation understanding that objects have qualities that do not change even if the object is altered in some way. arranging items along a quantitative dimension in a methodical way understanding that changes in one quality can be compensated for by changes in another quality considering changes in more than one dimension organizing objects by a variety of characteristics (size, color, shape, etc.) understanding that things that have been changed can be returned to their original state