This document provides instructions for a 2nd grade classroom activity where students work in groups to design a sandbox for the school playground. The activity is designed to teach math and science concepts. Students work in duos on specific tasks - one duo designs the geometric shape of the sandbox using a computer program, while the other duo researches accessories. The duos then combine their work to present the design to the class, with the goal of having their design chosen for the playground. The document provides guidelines and checklists to help students complete each step of the process successfully.