ResearchBenchmarksAcademic Illustration Usability Study (N=14)Follow13.2Completion Time (min)ECHO13.01614.25815.516.742May 11, 2026Evaluation ResultsMethodMethodLinksCompletion Time (min)NASA-TLX Overall ScoreSystem Usability Scale (SUS)Instruction Turns per TaskInstruction Length (words)Plan Confirmation RateUndo Count per TaskECHOCondition=ECHOCondition=ECHO2026.0513.265.478.611.412.381.31.7BaselineCondition=PowerPoint +...Condition=PowerPoint + ChatGPT2026.0517.882.652.38.234.7——