# Chapter 6 — Practice-on-your-own hints — Companion > Diagnostic hints for the Practice-on-your-own problems from Chapter 6 of The Defensible Decision. Canonical URL: https://www.thedefensibledecision.com/ch/06/practice/ [← Chapter 6 companion](/ch/06/) · [All chapter resources](/ch/) 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](/ch/06/) — Aisha’s AIRS-cohort walkthrough, further reading, self-check quiz, and the hands-on accessibility-audit activity. - [Aisha’s AIRS cohorts dataset](/datasets/aisha-airs-cohorts/) — the six-cohort scenario behind the two figures on the Chapter 6 companion page. - [All chapter companion pages](/ch/). - [Feedback](/errata/) — 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.