Protocol
Move from the concrete case to the rule
An example should lead somewhere, not become the whole lesson.
When it fits
- A learner understands your example but cannot use the underlying idea elsewhere.
When to avoid it
- Do not strip away a detail that changes the rule. An attractive analogy can hide a critical exception.
Why it matters
Show a concrete case, map it to a simpler representation, then express the general rule. Make the correspondences explicit at each move. Concreteness fading comes from instructional research; this short workplace sequence is an application to test.
Steps
- Start with a familiar case whose details make the relation visible.
- Replace incidental details with a diagram or small table, explaining what stays the same.
- State the rule and test it on a case with different surface details.
An example
To explain duplicate detection, begin with two contact cards, mark the identity fields, then express the matching rule without relying on those names.
Check your result
Can the learner identify the same relation in a new domain and say where the analogy stops?
Keep this limit in mind
- Do not strip away a detail that changes the rule. An attractive analogy can hide a critical exception.
Connected ideas
Useful withDraw the process while you explain it
Evidence and sources
Provides context
The concreteness-fading review describes linking concrete representations to progressively more abstract ones in mathematics and science instruction.
Evidence does not establish this exact workplace teaching sequence as superior.
Concreteness Fading in Mathematics and Science Instruction: a Systematic Review · Abstract.