This document discusses using SASS to improve on SMACSS principles for organizing CSS. It recommends using SASS features like mixins, partials and nested media queries to increase reusability, reduce file size and improve organization. Semantic class names and semantic grids are also suggested to allow cleaner, more maintainable CSS code and increase control over markup. The overall message is that SASS can help address issues with non-semantic classes and limited control over markup when using SMACSS alone.