A student writes, 'Photosynthesis is a process where plants convert light into energy that they use to grow.' This is a beginning, but it is not thorough explanation. It states what photosynthesis is but does not explain how it works. A more complete explanation would describe the role of chlorophyll, the relationship between light energy and chemical energy, the inputs and outputs of the process, and why the process matters. Teaching students to move from basic definition to thorough explanation that addresses a reader's likely questions is what expository writing instruction is about.

Expository writing is not the most glamorous form of writing. It is not creative or personally expressive. But it is essential. Students need to explain scientific processes, historical events, mathematical concepts, and countless other ideas. They will spend careers writing explanations, instructions, and descriptions of processes. Teaching expository writing well prepares them for the writing they will actually do.

Clear expository writing requires understanding the audience. What does the reader already know about this topic? What information do they need? What is likely to confuse them? Writing clearly requires anticipating questions and addressing them. It requires defining unfamiliar terms. It requires organizing information so the reader can follow. These are learnable skills.

Expository writing also requires accuracy. Explaining a process incorrectly misleads the reader. A student who does not understand photosynthesis cannot explain it clearly. This means expository writing requires research and thinking about the topic more deeply than personal writing requires. Students often underestimate how much work goes into clear explanation. They think stating facts is enough. But clear explanation requires synthesis and deep understanding.

Strategies for Clear Explanation

Several strategies help writers create clear explanations. Using these techniques deliberately improves expository writing.

• Definition and context: Begin by defining the concept and explaining why it matters or how it fits into a larger framework.
• Breaking into steps: For processes, break them into sequential steps and explain each one before moving to the next.
• Using examples: Provide concrete examples that illustrate abstract concepts, making them more understandable.
• Analogies and comparisons: Compare something unfamiliar to something the reader likely knows, making explanation more accessible.
• Visuals and structure: Use headings, lists, and other organizational tools that help the reader follow complex information.

Anticipating Reader Questions

One of the differences between novice and expert expository writers is that experts anticipate what the reader will want to know. A student explaining photosynthesis might assume the reader understands what chlorophyll is. But an expert might recognize that the reader needs photosynthesis explained in context of cellular respiration to really understand it. The expert anticipates that question and addresses it. Teaching students to think about reader questions improves their expository writing.

A practical strategy is to have students write an explanation, then have someone unfamiliar with the topic read it and ask questions about anything confusing. The questions reveal gaps in explanation. The student can then revise to address those gaps. This process helps students understand what explanation is from a reader's perspective.

Organizing Complex Information

Organization is crucial for expository writing. A reader needs to be able to follow the explanation. This might mean organizing sequentially for a process. It might mean organizing from simple to complex for a conceptual explanation. It might mean organizing by categories for a topic with multiple aspects. Teaching students to choose an organizational structure that serves their purpose makes their explanation clearer. A reader who gets lost in the organization cannot follow the explanation, no matter how accurate it is.

Transition sentences between sections help the reader follow the organization. A transition might explain how one section relates to the previous one or preview what comes next. These guideposts help readers navigate complex information.

Avoiding Jargon and Technical Language

A common problem in student expository writing is unnecessary jargon. A student uses technical terms without defining them, assuming the reader will understand. This confuses readers. Writing that explains to a general audience should define technical terms or avoid them in favor of more accessible language. Writing for an audience of experts might appropriately use jargon. Teaching students to think about their audience and adjust language accordingly improves clarity.

Sometimes a technical term is necessary and the best choice. In that case, define it clearly the first time it appears. After that, use it as needed. The reader now knows what it means. This balances clarity with precision.

Testing Clarity Through Revision

Clarity is often easier to improve in revision than in drafting. A student writes a first draft focusing on getting information down. In revision, they read asking, 'Is this clear? Will a reader understand this? Are there steps I skipped? Terms I did not define?' This questioning often reveals places where explanation is incomplete. Revising to improve clarity transforms a draft that makes sense to the writer into explanation that makes sense to a reader.

Having someone unfamiliar with the topic read the draft and provide feedback is the most effective revision strategy. Does the reader understand? Where did they get lost? What confused them? This feedback reveals gaps that the writer, who is too close to the material, cannot see.