Exhibit: A team tests stronger adhesive, colder storage, and thicker labels all in the same week. Label peeling drops, but the team cannot tell which change helped. Text exhibit: Experiment planning diagram with three factor boxes labeled Adhesive type, Storage temperature, Label thickness all pointing to outcome 'Label peeling rate.' Add a warning label: 'changed together, cause unclear.' Show a second row with one factor highlighted at a time. What should they do next?