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Biochar has been shown to benefit crop growth and yield, and is a promising material for use in agriculture. However, as is the case for any soil amendment, its efficacy must be shown in a variety of cropping systems, and at this time (2009) optimal application rates have yet to be determined. Also, many groups and individuals coming from a variety of backgrounds are interested in testing biochar. This is why the International Biochar Initiative (IBI) has produced this guide, to help those interested in testing biochar in soil to design and run sound experiments, the results of which can be used to draw strong conclusions and can be disseminated to a wide audience.