Develop higher-order thinking skills using graphic organizers common on standardized tests. Includes T-chart on one side for gathering and displaying data and Venn diagram on reverse for comparing and contrasting. Encourages deeper comprehension of any subject as students write with dry- or wet-erase markers, or work with manipulatives. Eco-friendly mats eliminate the need for photocopying and measure 17" L x 11" H each. set of 30.