Number, Measurement and Space, module establishes equivalence of sets by a one-to-one exchange of objects. Eg Upsetting equivalance (destroying conservation of numbers) by adding one object to a set, or taking one away, helps introduce vocabulary for comparing quantity
Classification, ECC (Early Childhood Curriculum) module is designed to help lay a foundation for the beginnings of concrete operations. This kit helps students focus on identifying properties of objects and matching objects. Teacher's guide included