Keep this light. Hold up one sheet of paper and pretend it is an umbrella, then smile and ask the class if it would work in the rain. Take two or three quick answers only.

Do not tip out the materials tray yet. That comes in the next play beat. The only prop you need in hand is one sheet of ordinary paper.

Nature of STEM thread: makers and builders pick the material that suits each job best. You will name that later when children share their choices.

Hold up a soft fabric scrap and a wooden block so the class can see and feel the contrast first. Ask the teddy question and let children point or call out their why in their own words.

Only after they have chosen and said a short why, you may put two tiny board labels: suits and why (reason). Keep the board short; do not ask infants to use the adult word suit out loud. The table below is for you only.

Modelled choice (say this out loud once before play): "I wonder which material is best for a teddy. I feel the wood — it is hard. I feel the fabric — it is soft. I choose the fabric. My why is: a teddy needs to be soft to cuddle. That material suits the job."

Misconception to head off: children may pick the prettiest or favourite colour. Gently steer them back to the job: "Does that help the umbrella keep us dry?"

Before the lesson

• Set out one materials tray per group with the samples listed in materials. Make the two plastics obviously different: clear see-through document-wallet plastic for the window role, and opaque coloured carrier-bag or tablecloth plastic for the rain role.
• Have one small cup of water and a paper towel ready for the shared teacher water check.
• Print the provided job picture cards (one set per group) for the next step; keep them face down until then.

During this step

Whole-class gather first (about 1–2 minutes on the carpet or clustered at the front): Bring everyone close so every child can see your hands. Hold up ordinary paper and the opaque bag plastic (name them by showing: this paper / this bag bit). Put one drop of water on each, high enough and slow enough that the back row sees the contrast. Children watch: paper soaks or darkens; bag plastic keeps the water sitting on top (keeps water out). Wipe straight away. Name what they saw in child words: keeps water out / lets water in. If needed, walk the two wet samples slowly past the front row so the soak versus water-sitting-on-top is unmistakable.

Then send children to the pre-set trays for free handling in short bursts. Circulate and prompt one property at a time: Is it soft or hard? Can you see through it? Would it keep rain out? Hold up the clear wallet bit when you ask about seeing through so non-readers link the feel-word to the scrap. Give metal and wood a quick spoken role so they are not stranded samples later: Metal is strong and smooth — good for spoons and lids. Wood is hard and strong — good for blocks and furniture. No sorting yet — this is noticing time.

Look-fors:

• Children use feel words (soft, hard, bendy, smooth, rough).
• Someone notices they can see through the clear plastic (not the bag plastic).
• Someone links the water check to paper feeling weak or soaking.

If a group only names colours, model one property yourself: This fabric feels soft on my hand.

Safety: nothing in mouths; keep small scraps on the tray; teacher holds the water cup; one drop only; wipe spills straight away.

Provided job picture cards (print one set per group)

Each card needs a large clear picture of the job plus the short job line below. Pictures carry the meaning for non-readers. No answers on the pupil cards. If you use the low-cost sticky-note substitute, draw a big simple picture on each note and write the job line underneath for you to read aloud.

Card 1 — Umbrella: We need something that keeps the rain off us.

Card 2 — Teddy: We need something soft to cuddle.

Card 3 — Window: We need something we can see through that keeps the weather out.

Card 4 — Bag: We need something strong that can hold our books and lunch.

Before groups start

Hold up each card in turn and read the job line aloud so every child hears the need. Then say once: Pick the best fit for each job. Some materials stay on the tray on purpose — the spoon or lid can stay. The umbrella wants the bag plastic that keeps water out. The bag can use cardboard so we do not fight over one scrap.

For less confident groups, stage the cards one at a time: match umbrella first, then teddy, then window, then bag.

Teacher answer key (do not print on pupil cards)

• Umbrella → opaque waterproof plastic (keeps rain / water out).
• Teddy → soft fabric (soft to cuddle).
• Window → clear see-through plastic (see-through stand-in for glass).
• Bag → cardboard or sturdy plastic (strong enough to hold things). Default bag fit is cardboard so the waterproof scrap is free for the umbrella. Accept thick card or strong paper only if a child says it is strong enough to hold books; ordinary thin copy paper is a weak fit.

Metal and wood have no job card on purpose. Both may stay on the tray. If a group wants to use metal, ask for a real reason (strong and smooth for spoons and lids). If a group wants wood, ask for a real reason (hard and strong for blocks and furniture) or leave it on the tray. More than one sensible choice is fine if the child gives a real reason. Paper for an umbrella is a chance to talk, not a scolding.

How to run it

Give each group the four job cards. Children place one material sample beside each card and say a short why out loud. Visit groups and ask: Why that one? Revoice strong reasons for the whole class to hear.

Differentiation: less confident children point and use a stem you say for them — I chose this because it is…. Confident groups can say one material that would be a poor fit and why.

Whole-class, oral only. Invite two or three groups to hold up one match and say their reason. Celebrate different good reasons when they fit the job. Keep the share on the cards and materials they just used.

Draw out:

• Umbrella needs a material that keeps water out (keeps the rain out).
• Teddy needs something soft.
• Window needs something we can see through.
• Bag needs something strong enough to hold things.

Nature of STEM weave (one short teacher sentence, tied to a card they hold — do not turn this into a class quiz): Makers pick the material that suits each job best — just like you did for the teddy and the umbrella. You may add, still as teacher talk: a coat-maker chooses material that keeps Irish rain out; a toy-maker chooses soft fabric for a teddy.

Misconception: if someone says "heavy things are always best", point back to the teddy — soft matters more than heavy.