CCSS.ELA-Literacy.RST.9-10.2

ELAGrades 9–10Key Ideas and Details

The Standard

Determine the central ideas or conclusions of a text; trace the text's explanation or depiction of a complex process, phenomenon, or concept; provide an accurate summary of the text.

Common Core State Standards for English Language Arts · Reading Standards for Literacy in Science and Technical Subjects 6—12

What This Standard Means

Students need to find the main ideas or conclusions in a science or technical text, not just pick out interesting facts. They also need to track how the author explains a process, concept, or phenomenon step by step, including cause and effect, sequence, and key relationships.

Mastery looks like a clear summary that is accurate, neutral, and based on the whole text. Students often get stuck by copying sentences, listing details without a main idea, or missing how one step leads to the next in a process.

Ways to Teach It

  • Give pairs a short lab article and have them build a flowchart showing each step in the process and its purpose.
  • Ask students to write: What is the author trying to prove or explain, and which three details matter most?
  • Use an exit ticket with one paragraph: students write the central idea and one sentence explaining the process described.
  • Have students summarize instructions for using a school device, then compare their summary to the original manual for accuracy.

Plan a Lesson for CCSS.ELA-Literacy.RST.9-10.2

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What This Unlocks

Mastery here sets students up for these next.

Related Standards

Standard text verified against corestandards.org on July 10, 2026.

Page updated July 10, 2026.

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