A variable can change. A fair comparison changes the feature in the question while keeping other relevant features alike. The independent variable is what you change; the dependent variable is what you observe or measure. Safety: Adult supervises low releases; no throwing, fans, stairs or outdoor wind tests. Stop: End after three releases. Stop for slipping, reaching or drifting toward a person; never stand on furniture.

Materials: Two equal paper sheets; Ruler, paper and pencil; Adult partner and clear indoor floor space 1. Write your own safe question about paper shape and falling before using the scaffold below. Adult approves a clear indoor floor and releases no higher than 50 cm. 2. Choose the enquiry type. A fair comparison suits a shape question; watching one leaf change suits observation over time. State what your choice can answer. 3. Plan the variables and outcome. Suggested scaffold if needed: compare flat and loosely crumpled equal sheets; observe which lands first when released together. Control paper type, starting sheet size, lowest-point release height, release time and air movement. Plan three paired releases. 4. An adult checks the plan before testing. Mark the lowest-point release height with the ruler, hold each shape without pushing, align its lowest point with the height mark, and release together. Record Trial | First to land | Release fair? | Notes. Mark uncertain if you cannot tell; do not invent a time. 5. Complete the three planned trials, resetting shapes. Mark unequal releases. Explain why equal height matters and how unequal releases could affect the conclusion. Done: A safe variable plan is written before three actual paired releases and the learner explains one control. Proof: Keep the prior plan and every trial note. Record adult release help and scaffold use. Stop: End after three releases. Stop for slipping, reaching or drifting toward a person; never stand on furniture.