Author note — to cover

Draw and interpret bar charts for categorical and ungrouped discrete data: equal-width bars, gaps between bars, labelled axes, a sensible frequency scale. Reading questions cover totals, differences and part-scale divisions. Two-set charts move to Dual and composite bar charts; continuous data needs touching-bar diagrams, never bars with gaps. Both tiers. (S2)

• Fluency — direct questions on bar charts, limited to this lesson's stated scope (4 questions).
• Application — use the same skill in unfamiliar or contextual questions without introducing a later method (4 questions).
• Check — questions built around the exclusions and likely misconceptions named in the lesson brief (4 questions).