Lesson-specific diagram for Green-chemistry redesign challenge and unit mastery. It visualizes the reasoning sequence tied to $\text{baseline process}\to\text{metric}\to\text{redesign}\to\text{trade-off}$. Text alternative: A defensible redesign specifies a baseline, measurable improvement criterion, new risks/trade-offs, and evidence needed to judge the proposal. Choose a representation that matches the chemical scale and evidence; do not infer more precision or mechanism than the data support.