# C19 · Two jobs, same resource

## Boundary

Do not transfer a folding observation to can strength or recycling outcomes.

## Complete source

Fictional maker chooses a source-labelled aluminium foil backdrop or a source-labelled aluminium-can diagram; F1 names both general uses. No specific product performance is tested.

## Id

C19

## Invitation

Choose a job and explain what source and further observation would help.

## Next try

Make a second explanation for the other reader with a different open question.

## Ordinary possible response

The same named metal has different uses; my chosen job needs its own evidence.

## Title

Two jobs, same resource