When you should use this chart

• Places several values side by side per category – e.g. approval ratings 2022 vs. 2026 per party, or East/West comparisons per indicator
• The right choice when the individual values carry the story rather than their sum (then: stacked)
• More precise than two separate charts, because the pairs are directly comparable
• Proven with 2–3 series; from four bars per group, readability suffers noticeably