Analyzing Author's Purpose in High School English 9

When we ask students to look at a scientific text, they often settle for a surface-level summary. In high school English 9 classes, we need to push them past the facts to understand the mechanics behind the writing. The Analyzing Author’s Purpose in Scientific and Technical Texts lesson is designed exactly for that shift in perspective. It moves students from passive readers to active analysts who can spot why an author chose a specific path to communicate complex ideas.

Understanding the technical standard

The core of this work is CA.ELA.RST.9-10.6. This California-adopted standard requires students to analyze the author’s purpose in providing an explanation, describing a procedure, or discussing an experiment in a text, while defining the question the author seeks to address. Teachers across Fremont Unified, Perris Union High School District, Val Verde Unified, and Hesperia Unified use this same standard to ensure students can handle the technical reading expected in post-secondary settings.

Breaking the standard down reveals three distinct demands. First, the student must recognize whether the text explains a concept, details a procedure, or covers an experimental discussion. These are the three pillars of technical literacy. Second, they must connect that form to its function. Why did the author write this? Finally, they have to identify the underlying question. If a text describes how a cardiovascular system circulates oxygen, the question isn’t just about hearts; it is about how the heart and blood vessels work as a system.

How the lesson builds these skills

This high school English literacy lesson gets right to the point. It starts with the familiar: reading manual instructions for a digital thermometer. By looking at a simple laboratory tool manual, students see that technical writing is meant to solve a problem or guide a user to an outcome. It is not just about conveying information; it is about performance.

The lesson moves to a worked example involving a lab safety document about neutralizing chemical spills. It breaks down the sentence about creating a stable salt and water mixture to explain a neutralization process. By naming this an explanation, the lesson shows students how to define the question the author addresses, which in this case is how the chemical reaction works. It is a clean, effective way to model the analytical process before turning the students loose on a cardiovascular passage.

Where students slip

Students often mistake the topic of a passage for the author’s purpose. They might say the purpose of the neutralization text is to teach about chemicals. That is a topic, not a purpose. The purpose is to provide safety instructions by explaining the chemical reaction. Helping students differentiate between what the text is about and what the author is trying to achieve with the text is the hardest part of this unit. I usually spend extra time ensuring they can articulate the specific question being answered. If they can frame the question, they can usually identify the purpose.

Classroom implementation

This lesson fits well as a whole-class assignment when you are beginning a unit on technical writing. It is also quite effective for a student who missed the week of direct instruction and needs to catch up on the fundamentals of literacy in science. If you have a substitute day, this is a strong choice because it is self-contained and requires exactly the kind of deep, quiet focus that benefits a student working independently. The vocabulary is minimal but essential, focusing on the distinction between a procedure, a series of steps for a task, and an experimental discussion, which details investigation results. It is straightforward, practical, and it respects the students’ time by focusing on the mechanics of technical text rather than filler.