"The Pyramid Principle" by Barbara Minto is a guide to clear business writing. Minto, a former management consultant, observed that the common issue with business writing was not language but the structure of thinking. She developed "The Pyramid Principle," a system for organising ideas in a pyramidal structure, starting with the most important point at the top and progressively breaking down into supporting ideas. This principle ensures logical clarity and helps readers absorb information efficiently. The book provides practical examples and explains how to apply this principle to various writing tasks, from memos and reports to presentations.