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tags: [] - coffee/roasting - coffee/tasting - coffee/education aliases: - Sensory Evaluation module - Roast quality evaluation module

Module 5 — Sensory Evaluation & Roast Quality

Tags: #coffee/roasting #coffee/tasting #coffee/education Aliases: Sensory Evaluation module, Roast quality evaluation module Related: Roasting MOC | Cupping | SCA Flavour Wheel | Sensory Science | ../Coffee Tasting/Flavour Memory Pt1 Status: ✅ Complete

Overview

Module 5 covers sensory evaluation as applied to coffee roasting — how roasters assess the quality of their roasted coffee through cupping, how to identify whether a roast has been developed correctly, and how to map sensory feedback back to roast profile decisions. Sensory evaluation is the essential feedback loop in roasting: without reliable taste assessment, profile adjustments are uninformed. This module builds on the roast science covered in Modules 3 and 4 to connect physical roast decisions to their flavour outcomes.

Module Content

5.1 — Cupping for Roasters

The SCA cupping protocol is the standard format for evaluating roasted coffee quality in a roastery context:

  • Purpose: Removes brewing variable influence; allows consistent, comparable evaluation of the coffee itself
  • Protocol: 8.25 g per 150 ml water; water at 93°C; 4-minute steep; crust broken at 4 minutes; evaluation at 8–12 minutes
  • Attributes scored: Fragrance/aroma, flavour, aftertaste, acidity, body, balance, uniformity, clean cup, sweetness, overall
  • SCA score interpretation: ≥ 80 = specialty grade; < 80 = commodity; ≥ 90 = exceptional

See Cupping for the full protocol.

5.2 — The SCA Flavour Wheel as a Roast Evaluation Tool

The SCA Flavour Wheel organises coffee descriptors hierarchically, enabling systematic identification of flavour character:

  • Roast-derived descriptors: Caramel, chocolate, nutty, roasted, smoky, ashy — these increase with roast development
  • Origin-derived descriptors: Fruit, floral, tea, bright acidity — these decrease with increasing roast development
  • Defect descriptors: Ferment, rubber, phenol, baked, scorched — these indicate processing or roasting faults

See SCA Flavour Wheel.

5.3 — Reading Roast Quality from the Cup

Specific sensory characteristics indicate specific roast outcomes:

Sensory finding Likely roast cause
Flat, dull, cardboard Baked roast — RoR stalled; insufficient development energy
Sharp, acrid bitterness; smoke Over-roasted; too dark or scorched
Sour, bright, thin Under-developed; light roast requiring more time post-crack
Balanced sweetness, caramel, chocolate Well-developed medium roast
Fruity, floral, bright acidity Light roast; origin character dominant
Harsh, drying astringency Phenolic compounds; possible under-development or processing issue

Cross-referencing sensory findings with the roast log allows the roaster to identify and adjust the source of the problem.

5.4 — Developing Flavour Memory for Roasters

Consistent sensory evaluation requires a calibrated flavour memory:

  • See ../Coffee Tasting/Flavour Memory Pt1 for foundations: anchoring descriptors to physical references, maintaining a tasting journal, regular cupping practice
  • See ../Coffee Tasting/Flavour Memory Pt 2 for advanced calibration: threshold detection, triangle testing, inter-rater reliability

5.5 — Roast Quality Control Workflow

A practical quality control process for a roastery:

  1. Roast and log — record the complete profile (RoR, drop temperature, first crack time, DTR)
  2. Rest — allow beans to degas adequately (48–72 hours minimum for filter; 5–10 days for espresso)
  3. Cup — evaluate using SCA protocol; record scores and descriptors
  4. Compare — compare with previous roasts of the same green lot; identify changes
  5. Adjust — modify profile variables (charge temperature, gas, airflow, drop time) based on sensory feedback

Key Facts

  • The SCA cupping protocol is the standard quality evaluation format for roasters; consistent preparation isolates the coffee from brewing variables
  • Flat, dull character indicates a baked roast (stalled RoR); acrid bitterness indicates over-development; sour thinness indicates under-development
  • Roast-derived flavours (caramel, chocolate, roasted) increase with development; origin-derived flavours (fruit, floral) decrease
  • Adequate rest time before cupping is essential — CO₂ off-gassing continues for days post-roast; evaluating too early gives inaccurate results
  • Building reliable flavour memory is the foundation of consistent sensory evaluation across roast batches

References

Changelog

Date Change
2026-04-29 Note created

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