Filtering by attribute product

Hi,
Does anyone have an idea how to implement sorting on the attributes of products?
Example:
http://www.build.com/single-bowl-kitchen-sinks/c68890

Thanks,
Alex

nopworks wrote:
Do you mean sorting or filtering?
For filtering:
1) Define the specification attributes and their values admin>catalogAttributes>specification attributes: check example

2) Assign the specification attributes to each of your products admin>catalog>manage products>add/edit product>specification attributes tab. Check examples in demo admin/store

3) If you want the filter in the left column check here