Fine Robusta Cupping Protocols: Evaluating Acidity, Mouthfeel, and Cleanliness in Ugandan Lots
By Sandra Nansbuga
Fine Robusta Cupping Protocols: Evaluating Acidity, Mouthfeel, and Cleanliness in Ugandan Lots
The Fine Robusta cupping protocol used to evaluate Ugandan Robusta was built specifically for the species' chemistry rather than adapted from Arabica scoring, replacing Arabica's separate Acidity and Body attributes with a paired Salt/Acid Aspect Ratio and a Mouthfeel score, and adding a Bitter/Sweet Aspect Ratio that has no equivalent on the Arabica form. The protocol was developed jointly by the Uganda Coffee Development Authority and the Coffee Quality Institute through workshops held in Kampala between 2009 and 2010, specifically to avoid grading Robusta against Arabica's flavor assumptions.
Why Robusta needed its own cupping form
Under the Robusta Cupping Protocols developed by UCDA and CQI, submitted to the International Coffee Organization's Private Sector Consultative Board, Robusta's naturally higher potassium levels produce an inherent salinity, and its caffeine and potassium content produce an inherent bitterness, neither of which is a defect in Robusta the way an analogous flatness might be scored down on an Arabica form. The protocol addresses this directly: the Salt/Acid Aspect Ratio evaluates the balance between perceived saltiness and acidity, with lower salt and higher acid both scored favorably, while the Bitter/Sweet Aspect Ratio evaluates the balance between bitterness and sweetness, with lower bitterness and higher sweetness scored favorably. Mouthfeel, evaluated as a combination of weight and texture, replaces the standalone Body attribute used on Arabica forms.
The cupping form scores 10 attributes in total: Fragrance/Aroma, Flavor, Aftertaste, Salt/Acid Aspect Ratio, Bitter/Sweet Aspect Ratio, Mouthfeel, Balance, Uniform Cups, Clean Cups, and Overall, each contributing to a Total Score, from which Taints (2-point deductions) and Faults (4-point deductions) are subtracted to produce a Final Score. Under the protocol's classification scale, a Final Score of 80 or above qualifies as Fine Robusta, with the 90-100 range classified as Very Fine and the 70-80 range as Premium.
How the Robusta and Arabica forms compare
| Attribute area | Arabica (SCA cupping form) | Robusta (CQI/UCDA cupping form) |
|---|---|---|
| Acidity | Scored as a standalone Acidity attribute | Paired with saltiness as Salt/Acid Aspect Ratio |
| Body/texture | Scored as a standalone Body attribute | Scored as Mouthfeel (weight and texture combined) |
| Bitterness/sweetness | No dedicated paired attribute | Scored as Bitter/Sweet Aspect Ratio |
| Roast level for cupping | Lighter roast (Agtron "Gourmet" 63.0) | Darker roast (approx. Agtron 48 whole bean) |
| Specialty/Fine threshold | Specialty Grade: cupping score of 80+ | Fine Robusta: Final Score of 80+ |
What this means for buyers
A Q-Grader scoring Robusta on Arabica assumptions would misjudge the cup. Because Robusta's inherent salinity and bitterness are chemistry, not defects, a Robusta lot scored against Arabica's Acidity and Body attributes alone would likely be marked down for characteristics the Robusta-specific protocol treats as expected baseline traits. Buyers reviewing a cupping report should confirm it was scored on the CQI/UCDA Robusta form, not adapted from an Arabica score sheet.
Roast level matters for comparing cupping notes across labs. Since the Robusta protocol specifies a noticeably darker cupping roast than the Arabica protocol, two cupping reports on the same green lot roasted to different levels are not directly comparable. Buyers requesting a cupping score should confirm the roast level used matches the CQI/UCDA Robusta specification.
An 80+ score is a specific, checkable threshold, not a marketing description. Because Fine Robusta requires a Final Score of 80 or above under this protocol, after taint and fault deductions, buyers can ask for the underlying score breakdown, not just the "Fine Robusta" label, to confirm what a specific Ugandan lot actually achieved.
FAQ
Why does the Robusta cupping form include a Salt/Acid Aspect Ratio instead of a standalone Acidity score?
The CQI/UCDA protocol pairs salt and acid because Robusta's naturally higher potassium levels produce salinity that is not a defect; the paired score evaluates the balance between the two rather than penalizing Robusta for lacking Arabica-style acidity alone.
What score qualifies a Ugandan Robusta lot as Fine Robusta?
Under the CQI/UCDA protocol, a Final Score of 80 or above, after taint and fault deductions, qualifies as Fine Robusta, with 90-100 classified as Very Fine and 70-80 as Premium.
Where was the Robusta cupping protocol developed?
The protocol was developed by UCDA and CQI through workshops held in Kampala, Uganda, between 2009 and 2010, according to the document submitted to the ICO's Private Sector Consultative Board.