A classroom teacher requested the school counselor to test a second-grade child to determine if the child is academically developmentally delayed, normal development, and academically advanced. The counselor indicated he lacked training for a comprehensive assessment but would test to determine if a referral was appropriate. The counselor asked the child, as one part of several short test items, to name the number next from the following: 21, 23, 26, 30, ____. The counselor was testing for which one of Piaget’s concepts?
Select one of the following: