Classification of Materials

6th-8th Grade Performance Task

Contributed by: The RAND Institute (RAND)

In this task, two-way classification is explained using pictures of people who differ in terms of age (old and young), position (sitting or standing), gender (male or female), and type of clothing (summer or winter). In the materials classification section, students are given a collection of natural materials (e.g. sand, fur, rock, and pine cone) and are asked to create a two-way classification system. Then they are given a new material, a pencil, and asked where it fits in their system and why.