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