The document discusses using a pattern library to promote consistency in user interfaces. It defines a pattern library as a collection of reusable design elements that appear across a site. Benefits mentioned include consistent user experience, faster production, and a common starting point for collaboration. The document provides examples of companies that use pattern libraries and recommends starting by trying it out on a small scale, gaining support from others, and documenting patterns. It also outlines how to integrate a pattern library into an existing WordPress project.