✅ Investigation Plan Gate

Teams complete a polished Santa Ana investigation planning sheet and brief oral defense for the teacher that includes their final question, hypothesis, sampling logic, source list, data table structure, and intended visuals. The teacher checks whether the plan can produce evidence strong enough to evaluate claims about the issue and requires one specific revision if a source, comparison, or graph choice is weak. Students update a final checkpoint note describing the evidence they still need and the first collection step for the next phase.