This three-bin setup is the classic, DIY backyard composting system. It is the best choice for large families, rural properties, and avid gardeners because it has one pile to add to, one pile that is decomposing, and one finished pile to use in the garden. For instructions on building your own, go to extension.iastate.edu/Publications/PM
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How to Compost and the Different Types of Compost Bins : Home Improvement : DIY Network
Pile it up. The easiest way to make compost is to pile yard and kitchen waste in a designated place. Let nature work. Expose a compost pile to the elements where sun, rain will prompt the process. A two-bin system allows you to make compost in one bin and keep a supply of finished compost in the other. Alternating the heap harvest cycle with each pile,a continual source of compost. When worked into the soil, compost slowly gives plants nutrients and makes more air and water available to them.
6 Ways to Make Great Compost: In a three-bin compost system, the first bin (left) holds fresh materials ready for composting.Materials are moved to the second bin (middle) to keep things running hot and decomposing fast. Materials finish composting in the last bin (right).