Responsive design has already become a huge part of most modern websites these days. With more and more people now using phones and tablets, there is a huge variety of screen sizes. Not all websites look great on smaller screens so web designers are turning to responsive design. This enables the website to reorganise the contents to cater to the screen size.
Sparkbox have come up with a process they use when implementing responsive design. They've put their process into an infographic which they were kind enough to share.