The case in three lines. A school's Reading Wall rewards classes for logged reading minutes, and the minutes more than quadruple. Then it turns out students leave audiobooks running overnight and log minutes on the bus, while library loans fall. Opal asks what the number was standing in for, Loop shows what it actually rewarded, and Boaz asks what they are really protecting. The head asks Tara whether the wall should stay, and the case stops there.

One question to ask. "What did Tara say?" Then: "Who in the case was right?" A good answer finds something true in Mrs. Adeyemi, Dr. Hale and the students who gamed it.

One thing to do at the table. Think of one number your family or school watches: steps, screen time, grades, stars on a chart. Write in words what it is meant to stand in for. Then try to think of a way someone could make the number go up while the real thing goes down.

The grown-up layer. Goodhart's law: when a measure becomes a target, it stops being a good measure. The case is careful to show that nobody needs to be a villain for it to happen; the students followed the rule they were given, and the head needed a number for a report. It also refuses the easy fixes: tighter rules invite cleverer workarounds (Boaz), and scrapping the measure loses the real gains (Mrs. Adeyemi's eleven). Teenagers live inside dashboards, scores and streaks; naming this pattern gives them a way to step outside one.

The case leaves Tara's sentence blank on purpose. Ask for it before you offer yours.