This demonstrates Meg's difficulty with "class inclusion".
Class inclusion alludes to the capacity to arrange objects into at least two classifications at the same time. For instance, the capacity to perceive that extensive classifications, for example, 'marbles' incorporates littler sub-classifications, for example, 'blue marbles' or 'red marbles' or distinctive colors. Piaget showed that youngsters in the pre-operational phase of scholarly improvement experienced issues noting questions like 'are there more blue marbles or more marbles?' because of their powerlessness to comprehend class inclusion.