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Setting the Bar and the Bounds

A 60-minute Grade 5 lesson on defining a design problem with criteria that can be measured and constraints that are real.

Setting the Bar and the Bounds is a free 60-minute Grade 3 to Grade 5 science lesson plan for Common Core standard 3-5-ETS1-1 — define a design problem, with what counts as success and what limits you. It is timed across 5 sections, gives the exact wording to use where the wording carries the mathematics, names 3 misconceptions with the teaching move that addresses each, and ends with an exit ticket and a printable worksheet with its answer key.

Grade:
Grade 3 to Grade 5
Length:
60 minutes
Standard:
3-5-ETS1-1

Grade 3 to Grade 5 · Engineering Design

3-5-ETS1-1

Define a simple design problem reflecting a need or a want that includes specified criteria for success and constraints on materials, time, or cost.

Objective

Students will be able to write a brief whose criteria could be measured by somebody else.

Students are successful when they can

  • Writes criteria with a measurable standard.
  • Writes constraints that genuinely bind.
  • Spots a criterion that is really a solution.

What you need

  • A real problem: a water filter, a cool store, a compost design
  • Planning sheets with two columns
  • The printable practice sheet linked at the end of this plan

The lesson

Warm-up

5 min
  1. Offer the brief 'design a good water filter'.
  2. Ask two groups what they would build, and note how differently they answer.

Teach — could somebody else check it?

15 min
  1. Rewrite 'good' as 'removes all visible sediment from 500 ml in two minutes'.
  2. Ask what changed: another group could now check it.
  3. List constraints: materials in school, fifteen pounds, three lessons, safe unsupervised.
  4. Test a doubtful line: 'must use a coffee filter'. That is a solution, not a criterion.
  5. Say why solutions must not hide in criteria: they rule out better designs before testing.
  6. Add one criterion about the user, such as being understood by a Year 2 class.
“Could another group check that without asking you what you meant?”

Investigate — write, swap, score

22 min
  1. Groups write a brief with four criteria and four constraints.
  2. They swap briefs and attempt to score a sketch design against another group's.
  3. They mark every criterion they could not apply.
  4. They rewrite those and return the brief.

Independent practice

15 min
  1. Students complete the 'Setting the Bar and the Bounds' page.
  2. Check the sort is by function rather than wording.

Close

3 min
  1. Adopt one brief for the design and testing lessons.

What goes wrong, and why

Each of these is a reasoning error rather than carelessness. The fix addresses the reasoning.

Hides a solution inside a criterion.

Why: It feels specific.

Fix: 'Must use a coffee filter' rules out better designs before any test.

Writes criteria that cannot be measured.

Why: They express the goal.

Fix: If another group cannot apply it, rewrite it.

Invents constraints to look rigorous.

Why: Limits sound serious.

Fix: A false limit removes good designs for nothing. Only real ones.

If they are not there yet

  • Eight statements to sort.
  • Two criteria supplied to rewrite measurably.

If they finish early

  • Write a criterion that conflicts with a constraint and resolve it.
  • Add a criterion about the user rather than the device.
  • Say which criterion you would drop if time were halved.

Exit ticket

Rewrite 'design a good water filter' as one measurable criterion and one real constraint.

What to look for: A measurable criterion such as removing visible sediment from a stated volume, plus a real limit such as budget or materials. A restated goal means the measurable point needs another run.

Printable practice for 3-5-ETS1-1

Free to print and copy, answer key included. Each sheet can generate a fresh set of problems for a retake.

Questions about Setting the Bar and the Bounds

How long does the Setting the Bar and the Bounds lesson take?

60 minutes, split across 5 timed sections: warm-up 5 min, teach 15 min, investigate 22 min, independent practice 15 min, close 3 min. The minutes are stated per section and add up to the stated length, so the plan can be cut or extended at a section boundary rather than abandoned halfway.

Which standard does Setting the Bar and the Bounds teach?

3-5-ETS1-1 — 3-5-ETS1-1, Engineering Design for Grade 3 to Grade 5: “Define a simple design problem reflecting a need or a want that includes specified criteria for success and constraints on materials, time, or cost.” In plain terms, define a design problem, with what counts as success and what limits you.

What do I need to teach this lesson?

A real problem: a water filter, a cool store, a compost design, planning sheets with two columns and the printable practice sheet linked at the end of this plan. Everything listed is either ordinary classroom equipment or a free printable from this site — there is nothing to buy and nothing to prepare beyond photocopying.

What mistakes should I expect in this lesson?

Three, each a reasoning error rather than carelessness: hides a solution inside a criterion; writes criteria that cannot be measured and invents constraints to look rigorous. The plan gives the thinking behind each one and the teaching move that addresses the thinking rather than the symptom.

How do I know whether the lesson worked?

The exit ticket asks: “Rewrite 'design a good water filter' as one measurable criterion and one real constraint.” A measurable criterion such as removing visible sediment from a stated volume, plus a real limit such as budget or materials. A restated goal means the measurable point needs another run. That tells you whether the class needs a reteach or a thirty-second conversation before you plan tomorrow.

Is there a worksheet to go with Setting the Bar and the Bounds?

Yes — 1 printable 3-5-ETS1-1 worksheet, linked at the end of the plan and free like the rest of the site. Each one comes with an answer key and 25 versions, so the practice after the lesson can be a different paper on every desk.

Is Setting the Bar and the Bounds free to use?

Yes. The plan, its printables and their answer keys are free to read, print and photocopy for your own class, with no account and no email capture. It was last reviewed on 8 September 2026. Please do not resell it or republish it as your own.

Last reviewed 2026-09-08. Aligned to 3-5-ETS1-1 of the Next Generation Science Standards.