The main reason Sass and Compass based grid systems are great to work with is that they handle all the complex mathematics. Hands up who enjoys working out the percentage calculations necessary for layouts? I know I can live without that and a Sass and Compass based grid system allows us to deal with layouts in a less academic manner. They do this by using mixin names that abstract some of the complexities of widths into simpler terms. But we are perhaps getting ahead of ourselves. Let me first tell you a little about the first Sass and Compass based grid system I fell in love with.