conservation
identity
decentration
seriation
reversibility
classification
arranging items along a quantitative dimension in a methodical way
organizing objects by a variety of characteristics (size, color, shape, etc.)
understanding that changes in one quality can be compensated for by changes in another quality
understanding that objects have qualities that do not change even if the object is altered in some way.
understanding that things that have been changed can be returned to their original state
considering changes in more than one dimension
