Ready-to-use classroom activity
Students analyze 'yes' and 'no' examples to determine the attributes of a concept and generate their own examples.
Grade range
Works across
Activity style
Classroom walkthrough
One concrete example you can borrow, adapt, or teach as written.
Example lesson context
Gather these before class.
What to have ready before students begin.
Create two sets of cards: 'yes' examples (various invertebrates like insects, worms, jellyfish) and 'no' examples (vertebrates like fish, birds, mammals). Ensure cards have clear images and names. Prepare an attribute recording sheet for students to track observed patterns. Develop a hypothesis testing form for students to record and test their ideas about the concept.
A classroom-ready sequence from launch to follow-up.
Introduction to concept attainment (5-7 minutes):
Explain that students will be detectives discovering a hidden concept
Clarify they'll see examples that either fit or don't fit the concept
Their job is to figure out what makes the 'yes' examples similar
Demonstrate with a simple concept (e.g., shapes that are/aren't triangles)
Mystery concept presentation (10-12 minutes):
Begin displaying 'yes' and 'no' example cards one at a time
Start with clear contrasts (e.g., butterfly vs. fish) and move to more subtle differences
After each card, label it clearly as a 'yes' or 'no' example
Students quietly observe and take notes on patterns they notice
After 6-8 examples, pause for initial thinking
First hypothesis formation (5 minutes):
Students individually write their first hypothesis about what makes something a 'yes' example
Remind them to focus on all 'yes' examples, not just some
Students record specific attributes they've noticed in the 'yes' group
Additional examples and refinement (8-10 minutes):
Continue presenting more examples and non-examples
Include borderline cases that challenge initial assumptions
After each new example, students refine their hypotheses
Encourage them to cross out rejected ideas and add new observations
Hypothesis testing (5-7 minutes):
Show new examples without revealing the 'yes/no' status
Students predict classification based on their hypotheses
Reveal correct classification and discuss implications
Refine hypotheses further based on results
Concept naming and verification (5 minutes):
Once most students have accurate hypotheses, ask for volunteers to share
Guide class toward identifying the target concept (invertebrates)
Reveal the formal definition and key characteristics
Compare with student-generated attributes
Concept application (8-10 minutes):
Students create their own 'yes' and 'no' examples
In pairs, they test each other's examples
Discuss any disagreements or borderline cases
Connect to the larger classification system of animals
Extension: Students create a visual organizer showing different types of invertebrates and their specific characteristics.
Adjust the activity without losing its core purpose.
For younger students, use fewer examples and more obvious contrasts. For struggling learners, provide a partially completed attribute chart to guide observations. For advanced students, include more subtle examples and challenge them to create a classification system for sub-categories of invertebrates.
Use these signals to assess understanding.
Review hypothesis sheets for accuracy and refinement over time. Note which students can apply the concept to new examples. During discussions, evaluate students' ability to articulate key attributes accurately. Check final examples for correct application of the concept.