Look at these two clean empty items: a plastic bottle and a crisp packet. Which one do you think can usually go in the recycling bin, and which one cannot? Hands up your guess, and be ready to say why.

Those two items both look like plastic, but they do not belong in the same bin. Today we use clear questions so we can sort fairly, not by guesswork.

Before you sort anything yourselves, we agree the three questions we will all use.

Only three items go on the board, and all three are awkward on purpose: a crisp packet, a dirty tissue and a plastic bag. Hands up yes or no for each question, then see which bin each one lands in and say whether that seems fair.

Everything else is yours to sort in a moment.

In groups, put on gloves and sort the clean sample waste on your table into three trays: recycling, compost, and general waste. Use the same three questions we used on the board. Keep a simple tally as you go: how many items land in each tray. Talk about any item your group is unsure about before you place it.

Second job (when the audit notes are done): think about making less rubbish in the first place. Reduce means use less so less waste is made. Reuse means use something again before binning it. Write one practical reduce or reuse idea our class or school could try.