Writing to ExplainC – E – R

Model

Claim – Evidence – Reasoning

C-E-R in Science Writing( Claim – Evidence – Reasoning)

• Claim: A conclusion that answers the original question

• Evidence: Specific data that supports the claim. The data needs to be appropriate and sufficient to support the claim.

• Reasoning: A justification that links the claim and evidence. It shows why the data count as evidence by using appropriate and sufficient scientific/social science principles.

Department of ScienceDepartment of Social Sciences

Observation vs. Inference—Definitions

• Observation—Using all your senses (not just eyes) to collect and record information about our world.

Observations = EVIDENCE• Inference—Using observations to reach a

logical conclusions. Inferences = EXPLANATION• “An observation is what you see, feel, taste,

hear or smell. An inference is what you think.”Bell, Randy, Teaching the Nature of Science Through Process Skills, Pearson Education, Inc.,

2008, p. 41 3

Observations and Inferences in NGSSSScience

• Begin in Grade 1, continue through Grade 5• SC.1.N.1.2 Using the five senses as tools, make careful observations, describe objects in

terms of number, shape, texture, size, weight, color, and motion, and compare their observations with others.

• SC.2.N.1.5 Distinguish between empirical observation (what you see, hear, feel, smell, or taste) and ideas or inferences (what you think).

• SC.3.N.1.6 Infer based on observation. • SC.3.N.1.7 Explain that empirical evidence is information, such as observations or

measurements, that is used to help validate explanations of natural phenomena. • SC.4.N.1.6 Keep records that describe observations made, carefully distinguishing actual

observations from ideas and inferences about the observations.• SC.4.N.1.7 Recognize and explain that scientists base their explanations on evidence. • SC.5.N.2.1 Recognize and explain that science is grounded in empirical observations that

are testable; explanation must always be linked with evidence4

Observation vs. Inference – Boy in the Water

Our Observations and Inferences

• Develop a T-chart and place O and I on it O I

• Under O list three observations about the picture• Under I list three inferences about the picture• Share with your table• Discuss: Did you and your table write observations that are actually inferences, or vice versa?

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Directions: Place an ‘I’ before the statements that are inferences and an ‘O’ before the statements that are observations OR you may wish to make a T-chart.

1. The boy is in the water. 2. The weather is cold. 3. The tree branch is broken. 4. If the boy crawled out of the water, the goat would kick him. 5. The boy fell off the branch. 6. A goat is standing by the pond. 7. The branch will fall on the boy’s head. 8. The boy fell off the rocks. 9. There is a sailboat in the water. 10. The sailboat belongs to the boy. 11. The goat will soon leave the pond. 12. The tree by the pond has no leaves on it. 13. There are three rocks in the pond. 14. The tree by the pond is dead. 15. If it rains, leaves will grow on the tree. 16. The goat kicked the boy into the pond.

Observation vs. Inference – Boy in the Water

Sample Claim Evidence Reasoning Student Response

• Claim: The boy fell from the broken branch on the dead tree into the water while trying to retrieve his toy sailboat.

• Evidence: The tree branch is broken and the boy is in the water in a position directly below the branch. The boy in the water is also wearing a shirt. There is a sailboat toy in the water and the tree appears to have no leaves.

• Reasoning: No leaves on the tree may indicate that the tree is dead. This would mean that the branch would be very weak since leaves provide the tree with energy. The boy climbed the tree to get his sail boat and his weight, due to the force from the pull of gravity, was greater than what the dead branch could hold, so it broke and he fell into the water. The waves that were made after falling into the water, pushed the sailboat away from the boy. Where the boy is sitting must be in water because it makes up most of our Earth and sailboats float on water. Because he is wearing a shirt, he most likely did not want to get wet.

The Department of Mathematics and Science