The beauty of implementing Sass/Compass is that the learning barrier is low and only requires general knowledge of CSS. It can be utilized in existing popular CSS frameworks because it actually compiles to CSS. Sass stands for Syntactically Awesome Style Sheets and it will create mixins, set variables, do math when necessary and much more. Compass is the open-source CSS authoring framework where you can write Sass.

Compass is a CSS Meta-Framework that provides ports of the best of breed CSS frameworks to Sass and ready to use in your ruby-based web application or stand-alone via a simple command-line interface.