Evaluate students' ability to predict and test whether common classroom objects sink or float by forming simple hypotheses, selecting safe materials, conducting hands-on water tests, recording outcomes with drawings or checklists, comparing results to predictions, and explaining how properties like material, size, and shape affect buoyancy. Focus assessment on applying the scientific method, using vocabulary (predict, observe, sink, float), and communicating findings clearly for Pre-K to Grade 2 learners.