What is uniformity in cupping?
Uniformity is one of the ten attributes in the SCA cupping protocol. It measures the aromatic and taste consistency across the five cups brewed from the same lot: each cup should present the same profile. A high uniformity score means the coffee is homogeneous throughout the lot; a low score reveals instability at the farm, wet mill, or drying stage.
Uniformity scoring works the same way as clean cup: each of the five cups is evaluated individually. If it matches the profile of the other four, it receives 2 points. If it deviates noticeably — different acidity level, different body, different finish — it is marked non-uniform and loses 2 points. The maximum score is therefore 10 points for five perfectly identical cups.
Uniformity is an indicator of agronomic management and post-harvest processing skill. In single-farm specialty micro-lots, uniformity is high because cherries are sorted at uniform ripeness, drying is controlled (on raised African drying beds, in thin layers, turned regularly), and storage is stable. In cooperative lots blending contributions from dozens of small producers with varying ripeness levels, uniformity can suffer. This is one reason why single-farm micro-lots often achieve higher overall scores than cooperative lots, even when average aroma levels are comparable.
An important technical point: low uniformity can also stem from a roasting issue rather than the green coffee itself. If the roasting drum is overloaded, or if the heat profile is irregular, some beans develop less than others — creating 'quakers' or underdeveloped beans — producing a composite cup where well-roasted beans coexist with flat ones. A rigorous roaster sorts quakers out after roasting to avoid this. In Cup of Excellence competitions, uniformity represents up to 10 % of the total score and can determine whether a lot qualifies as Presidential (90+ points) or a standard Excellence lot.