Assess students' ability to sort and group classroom items (e.g., blocks, buttons, toys) by color, size, and shape; require them to label groups using age-appropriate vocabulary, explain orally or in writing why items belong together, identify items with mixed attributes, and demonstrate regrouping when criteria change (e.g., group by color then by shape). Include tasks that check understanding of the concepts of attribute, category, and justification through simple charts, Venn diagrams, or spoken explanations.