Coffee green grading can be complicated work with no standardization, and you might wonder why you should care about it. The grading system was developed so that coffees could be matched via quality. According to Cafe Imports, the coffee community found it for large-volume commodity and commercial contracts. In practice, a stockpile of Colombian green bean is exchangeable with a different supply of Colombian green bean as long as the quality is similar –it doesn't matter if the producer and even the microclimate is different. The roaster also uses the grading system to measure quality and roast consistency.