For instance, in the development from the process of counting to the number concept, the sequence of number words initially only function as utterances in the schema of pointing and counting, but then the last word becomes the name for the number of objects in the collection. In arithmetic of whole numbers, symbols such as 4+3 initially evoke a counting procedure (count-all) which is then compressed via “count-on” (which uses 4 as a number concept and +3 as a count-on procedure) to a “known” fact where 4+3 is the number 7. In this encapsulation there is a new concept, namely the sum, 4+3, but it relates to a known object (the number “7”). However, for the process of equal sharing for 3/4 (divide into four equal parts and take three) to be encapsulated requires the construction of a new mental object — a fraction. Hence the considerable increased difficulty with fractions as a succession of encapsulations and mental constructions.