Assess students' ability to design, build, and test a small boat from common classroom materials: make predictions about which materials will float, construct a simple boat, run controlled tests to observe floatability, stability, and basic load capacity, record results with drawings or tallies, compare outcomes to predictions, and explain in age‑appropriate terms why some materials floated. Intended for Pre‑K–Grade 2; emphasizes applying basic buoyancy and engineering thinking.