The document discusses the Claim-Evidence-Reasoning (CER) writing strategy for developing analytical thinking and argumentative skills. CER involves answering a teacher's question about a phenomenon or lab experience with three parts: a claim, evidence from the text to support the claim, and reasoning explaining how the evidence supports the claim. An example is provided where the question is about who is to blame for Romeo and Juliet's deaths, the claim is that Friar Laurence is most to blame, and evidence from the play and reasoning are given to explain why the evidence supports this claim.