The SCA cupping score system has a +/- 1-2 point margin of error between certified Q-graders, yet a single point can shift a coffee's price by $0.25-$1.00/lb

The Specialty Coffee Association's 100-point cupping scale, scored by certified Q-graders, is the primary mechanism determining whether a coffee qualifies as 'specialty' (80+ points) and its price tier, yet the system exhibits significant inter-rater variability where two certified Q-graders scoring the same coffee can diverge by 1-2 points. A coffee blindly presented to the same cupper 100 times returns a normal distribution that includes scores within +/- 1 point of the mean. Why it matters: a 1-point difference at the 79-80 boundary determines whether a coffee is classified as specialty or commercial-grade, so the farmer's price can differ by $0.50-$1.00/lb on that single point, so producers in origin countries systematically receive lower scores than importers in consuming countries for the same coffee, so farmers cannot reliably predict their revenue when contracting forward sales, so they underinvest in quality improvements because the scoring system cannot consistently detect them. The structural root cause is that sensory evaluation is inherently subjective -- influenced by palate fatigue, altitude of the cupping location, water chemistry, ambient temperature, and scorer calibration drift -- yet the industry treats cupping scores as precise, objective measurements and pegs economic value to narrow score bands.