Teachers use examples to illustrate when and how a concept applies across various situations. Nonexamples are used to show the boundaries of when the concept does not apply. For example, when teaching the vocabulary word imaginary, adding examples of when the word applies provides a deeper meaning of the word (examples: land of Oz, unicorn, dragon, monster, mermaid). Nonexamples are used to show the boundaries of when the concept no longer applies (nonexamples: school, horse, dinosaur). They work best when related to the example in some way (e.g., land of Oz and school are both places, unicorn and horse are similar, dinosaurs look like dragons and are no longer around, but dinosaurs were real). The examples and nonexamples work together to show how the vocabulary word applies. In phonics, examples are used to show when to apply a phonics rule and nonexamples emphasize when the rule does not apply.
When planning instruction using examples and nonexamples, teachers should consider showing a wide range of examples (demonstrating various ways the word applies), close-in nonexamples (identifying boundaries), and always end instruction with a positive example (instead of a nonexample).
Teaching using examples makes information more concrete to students. It helps students see when to apply the new word, strategy, or rule, to keep from underusing the new skill.
Example (of examples/ nonexamples):
Archer, A. L., & Hughes, C. A. (2011). Explicit instruction. New York, NY: Guilford Press.
Coyne, M. D., Kame’enui, E. J., & Carnine, D. W. (2011). Effective teaching strategies: That accommodate diverse learners. (4th ed) Boston, MA: Pearson.
Lesson plan generating examples and nonexamples for vocabulary words
https://intensiveintervention.org/sites/default/files/Example-Nonexample-508.pdf