Whether you're developing a static site, a dynamic site with a CMS (Drupal), or building an advanced web-based application with a Javascript framework (jQuery, jQuery Mobile, Sencha Ext JS, Sencha Touch, Angular, React.JS), you'll find that Sass and Compass are indispensable tools for taming and optimizing your CSS. You'll learn Sass and Compass by refactoring a very long and difficult to maintain single CSS file into a set of smaller, easier to manipulate .scss (Sassy CSS) files for optimal maintainability. You'll also improve download and rendering times by producing minified production builds, base-64 encoding your images, and automatically merge multiple images into sprites.