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Scientists’ predictions are based on their existing science knowledge

Key ideas

  • Existing science knowledge is made up of known science ideas that are supported by adequate data and accepted by the wider scientific community.


Scientists predict what will happen during an investigation based on their previous research, discussion with other scientists and direct experience. Predictions are part of a formal process of investigation.

Teacher reflection

  • Why are predictions based on existing knowledge?
  • How might incomplete science knowledge affect a scientist’s predictions?
  • Is it essential for scientists to make predictions? Why or why not?