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Bingen and Siyengo (2002) reported that more sophisticated electro‐mechanical cleaning and sorting equipment has set the conditions for elevators to respond to canning and processing standards, but it has also strengthened the role for individual expertise in grading. Instead of supplanting individual judgment, the investments in more sophisticated technologies require continued reliance on human expertise (the human eye) for grading beans.

ssss1 shows the appearance of beans and rejected debris samples taken at various stages of dry bean cleaning operations. As with all agricultural commodities, appropriate and specific bean quality standards must be established to enable adequate commercial commerce. It is important that thorough sampling and systematic inspection of each bean lot is conducted to assure compliance with designated quality specifications.

ssss1 Appearance of samples taken at various stages of dry bean cleaning/sorting operations. (For color detail, please see color plate section.)