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Text Elements
Based on the Promoting Reasoning and Conceptual Change in Science (PRACCIS) resources, see Chinn et al., 2021.
MEL Matrix example (arrows show relationship of evidence to alternative models)
Rate how good the evidence is (0-3)
Piece of evidence 1
Piece of evidence 2
Piece of evidence 5
Piece of evidence 4
Piece of evidence 3
Model 1: One model to explain this phenomena is… (or, one perspective on this issue)
Model 2: One model to explain this phenomena is… (or, one perspective on this issue)
Single arrow is ‘support’
Double arrow is ’ strong support’
Dotted arrow is neutral or irrelevant
Crossed arrows are ‘contradicts’
Matrix helps track evidence, its relevance, and quality, in relation to possible explanatory models.
- Evidence rating rates quality of evidence (0 is very poor, 3 is high quality; criteria can be decided together).
- Arrows show support of models by evidence, and level of strength for that support.
- It is possible for evidence to be strongly supportive, while also low quality. Mapping the support (in small groups) can be used to support discussion about the best model, and reasons for this.