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A school kite mela, a kite fair, needs a sheet by evening. The sheet is a printed list of the day's kites. Each kite has two measurements. Span is how wide the kite is. Tail is how long its tail is. Both are counted in hand-spans. A hand-span is the width of an open hand. This track builds the program that makes the sheet.

What this track covers

• The plan, in plain words. Four named jobs: collect, decide, order, report.
• Collect the day. Keep only today's kites from the check-in list.
• The distance between two. One number every later job uses.
• See the board. Kites drawn as points, nearest example marked.
• Write the classifier. A classifier gives each kite a word. It uses the nearest-example rule.
• When the nearest is wrong. One wrong word, traced step by step.
• Assemble and report. The four jobs, in order, printing a real sheet.
• Who it gets wrong. Right answers counted, group by group.

Eight lessons. Lesson 7 joins all four jobs in one program.