Content that is written in plain language is clear and concise, conversational and direct, and easy to follow without taxing the reader. Model System researchers should follow plain language principles when writing to ensure that the content will help patients and caregivers to access and understand health information. This tool presents the principles of plain language writing and offers guidance on how to follow these principles. It also includes information about how to test the language in your documents to determine whether they meet plain language principles. The examples in this tool show how to transform text using alternate sentence structures and word choices. The tool also includes information about two readability tests that writers can use to analyze their content and determine the reading levels of their products.