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Short diagnostic hints for the two Practice on your own problems in this chapter. Attempt each problem before opening the hint. Complete answers appear in Appendix G of The Defensible Decision: Practice Workbook.
Problem 1 — the red-green status chart
Restated: A support-ops dashboard uses red / yellow / green cells to mark SLA status across 40 service categories. Red-green color-vision deficiency affects about 8% of men of European descent, with prevalence varying by population. Name the specific failure this encoding creates, and rewrite the encoding so the meaning survives without losing the color-coded scan.
Show a diagnostic hint
Diagnostic cue. Ask whether the status encoding remains distinguishable without color, then add a redundant cue where it does not.
Complete answers appear in Appendix G of The Defensible Decision: Practice Workbook.
Problem 2 — the heatmap with divergent data
Restated: A finance chart uses a sequential (light-to-dark blue) palette to show revenue variance from plan, where the data ranges from −30% to +40%. Name the palette-type mismatch and the one-sentence Refine direction that fixes it. Include which color at zero.
Show a diagnostic hint
Diagnostic cue. Match the palette type to the data's order and center before evaluating chart polish.
Complete answers appear in Appendix G of The Defensible Decision: Practice Workbook.
Related on this site
- Chapter 6 companion page — Aisha’s AIRS-cohort walkthrough, further reading, self-check quiz, and the hands-on accessibility-audit activity.
- Aisha’s AIRS cohorts dataset — the six-cohort scenario behind the two figures on the Chapter 6 companion page.
- All chapter companion pages.
- Feedback — share corrections and improvement opportunities across all chapters.
About the three-tier Practice format
Each chapter of the book closes with a three-tier Practice block adapted from Cole Nussbaumer Knaflic’s course-adoption pattern in Storytelling with Data: Let’s Practice!: Practice with us (one worked problem with full solution in the book), Practice on your own (open problems with complete answers in Appendix G of the Practice Workbook; this page offers short diagnostic hints), and Practice at work (an open-ended prompt to apply the chapter’s move to a live artifact). This page hosts the middle tier.