This book investigates the fundamental principles of clear, effective communication by identifying the barriers that prevent plain, understandable language. Rudolf Flesch, a consultant and expert in readability, utilizes linguistic analysis and statistical formulas to argue that complex, jargon-heavy prose obscures meaning. He presents a structured framework for simplifying sentence structure, vocabulary, and organization to ensure the reader grasps the intended message immediately.

Experts frequently cite this work as a foundational text for technical and professional writing. Readers often note the practical utility of the prose, though some acknowledge that the specific readability formulas have been superseded by modern software tools.