Science Newsletter Explaining Claim-Evidence-Reasoning

Claim-Evidence-Reasoning is the writing frame most science classes use to teach scientific argument. Parents who see a CER response come home wonder why it is so short, why there is no introduction, and what the 'reasoning' part is supposed to do. This template explains it in one newsletter, with examples and the exact sentence stems students use in class.

Section 1: What CER is, in three sentences

Claim: a one-sentence answer to a science question. Evidence: the data or observation that supports the claim. Reasoning: the explanation of why the evidence supports the claim, using a science concept the class has learned. Three parts. That is the whole frame.

Section 2: Why scientists never just claim

Two sentences. "A claim with no evidence is an opinion. Real science needs both the data and the explanation of why the data means what you say it does, so other people can check your thinking." Parents see this and the short, specific format starts to make sense.

Section 3: A real example

Walk through one CER end to end. "Question: which spoon will feel hotter after sitting in warm water? Claim: the metal spoon will feel hotter. Evidence: in our lab, the metal spoon measured 41 degrees Celsius and the wooden spoon measured 28 degrees Celsius after two minutes. Reasoning: metal conducts heat more efficiently than wood because its particles are packed closer and can transfer thermal energy faster." Four sentences. Whole CER.

Section 4: The sentence stems we use in class

Three stems, written out. "My claim is that... The evidence I have is... This evidence supports my claim because (science concept)..." Parents can use these at home as well, when their child is stuck. By spring, students drop the stems on their own and write in their own voice.

Section 5: What to look for when your child shows you a CER

Three short checks. "Did they make a specific claim, not a general one? Did they use data with numbers or specific observations, not 'because it looked hot'? Did the reasoning name the science concept by name?" Parents can give useful feedback in 60 seconds without re-teaching the unit.

Example: a CER newsletter sent at the start of a chemistry unit

Opens with the three-sentence definition of CER. Notes why scientists do not just state a claim. Walks through the metal spoon example end to end in four sentences. Lists the three sentence stems used in class. Closes with the three checks parents can use when their child shows them a CER response. Total length: 470 words. A parent reads it once and recognizes every CER they see for the rest of the year.

Why this template works

Parents who do not know CER look at a six-sentence response and worry their child wrote too little. Once they understand the frame, they see the structure and know how to give feedback. They also stop asking 'where is the introduction?', which eliminates one of the most common parent emails of the year.

How Daystage helps with CER explainer newsletters

Daystage has a parent-explainer template you can drop the CER content into. You send it the first time a unit asks students to write a CER. The newsletter is archived so a parent who joined the class later in the year can read it on their own and catch up.