Defining Design Problems

Active learning works because fifth graders need concrete experiences to grasp abstract concepts like criteria and constraints. When students step into real roles, such as interviewing a client or sorting design limits, they see how definitions shape solutions before any building begins.

• 5th Grade
• Science
• 3 activities
• 20 min–45 min

Learning Objectives

1. Identify the key criteria and constraints for a given design problem.
2. Analyze user needs to define specific requirements for a design solution.
3. Critique a proposed design solution based on its ability to meet defined criteria and constraints.

Role Play

⏱ 30 min·Pairs

Role Play: The Client Interview

One student acts as a 'client' with a specific problem (e.g., 'I need a way to carry my cat on a bike'). The 'engineer' must ask questions to identify the criteria and constraints before they are allowed to sketch any ideas.

Prepare & details

What makes a problem solvable through engineering?

Facilitation Tip: During the Client Interview, provide a script template so shy students can focus on listening and recording the client’s needs rather than worrying about speaking.

Setup: Open space or rearranged desks for scenario staging

Materials: Character cards with backstory and goals, Scenario briefing sheet

• Apply
• Analyze
• Evaluate
• Social Awareness
• Self-Awareness

Think-Pair-Share

⏱ 20 min·Pairs

Think-Pair-Share: Constraint Sort

Give students a list of items (e.g., 'Must be waterproof,' 'Costs under $5,' 'Must be blue'). In pairs, they must sort these into 'Criteria' (goals) and 'Constraints' (limits) and justify their choices.

Prepare & details

How do constraints like time and money limit our creative options?

Facilitation Tip: For the Constraint Sort, group similar constraints like time and budget together to help students notice patterns in what limits engineers.

Setup: Standard classroom seating; students turn to a neighbor

Materials: Discussion prompt (projected or printed), Optional: recording sheet for pairs

• Understand
• Apply
• Analyze
• Self-Awareness
• Relationship Skills

Collaborative Problem-Solving

⏱ 45 min·Small Groups

Collaborative Problem-Solving: The Playground Fix

Small groups walk around the school playground to find a 'problem' (e.g., a puddle that never dries). They must write a formal 'Problem Definition' that includes at least three criteria and two constraints for a potential fix.

Prepare & details

Why is it important to interview the people we are designing for?

Facilitation Tip: In The Playground Fix, set a timer for each step so students experience how real-world constraints guide decision-making under pressure.

Setup: Groups at tables with problem materials

Materials: Problem packet, Role cards (facilitator, recorder, timekeeper, reporter), Problem-solving protocol sheet, Solution evaluation rubric

• Apply
• Analyze
• Evaluate
• Create
• Relationship Skills
• Decision-Making
• Self-Management

Teaching This Topic

Experienced teachers introduce criteria and constraints separately before combining them. Start with simple examples students recognize, like a backpack’s size or a tower’s height, to build intuition. Avoid moving too quickly to solutions; emphasize that problem definition is where engineering begins, not where it ends. Research shows that students who practice articulating constraints early design more effective solutions later.

What to Expect

Successful learning shows when students can explain the difference between criteria and constraints in their own words and apply this understanding to new problems. Listen for clear, measurable criteria and realistic constraints during discussions and written work.

Watch Out for These Misconceptions

Common Misconception

During Role Play: The Client Interview, watch for students who focus only on the client’s first request without asking follow-up questions to uncover hidden criteria.

What to Teach Instead

Use the interview script to model asking, 'What would make this solution fail?' to help students dig deeper into unstated needs.

Common Misconception

During Think-Pair-Share: Constraint Sort, watch for students who group constraints by type only, like all materials together, without considering how constraints interact.

What to Teach Instead

Have pairs present one constraint and explain how it might limit another, such as how 'only $20' reduces the choices of materials.

Assessment Ideas

Exit Ticket

After Role Play: The Client Interview, give students a half-sheet with a new scenario. Ask them to write two criteria and two constraints based on the client’s needs they heard in the role play.

Discussion Prompt

During Think-Pair-Share: Constraint Sort, circulate and listen for pairs explaining how a constraint like 'must be built in one week' affects their design choices, then ask the class to share these insights aloud.

Peer Assessment

During Collaborative Problem-Solving: The Playground Fix, have students exchange their problem statements and use a checklist to review their partner’s criteria for measurability and constraints for realism before finalizing their designs.

Extensions & Scaffolding

• Challenge students who finish early to add a hidden constraint to their playground problem, such as 'must be accessible to students in wheelchairs,' and explain how it changes their design.
• Scaffolding for struggling students: Provide a word bank of criteria and constraints during The Playground Fix to support language development.
• Deeper exploration: Invite the school custodian to share a real design problem at the school, such as improving hallway traffic flow, for students to analyze and solve.

Key Vocabulary

criteria	The specific requirements or standards that a design solution must meet to be considered successful.
constraints	The limitations or challenges that must be considered when designing a solution, such as time, materials, or cost.
user needs	The problems, desires, or requirements that the intended recipient of a design solution has.
design problem	A specific challenge that can be addressed through the creation of a new product, process, or system.