Professional Detailing2 min read

Coating Rating Scales: Define What Each Score Means Before Averaging

A numerical rating is easier to interpret when each score has a defined meaning. Without clear anchors, different reviewers may use the same number for different observations during a coating evaluation.

Updated · NANOLAB Knowledge

The key distinction

Decide whether the scale records ordered categories, a measured quantity or a preference. Those are different data types. The analysis should respect what the scale represents rather than assuming that every step between numbers has equal practical meaning. Include examples or reference descriptions where they improve consistent use.

Practical checks

  1. Write observable descriptions for the scale points.
  2. Train reviewers on representative samples before the main assessment.
  3. Preserve individual ratings and disagreements alongside any summary.

Example

Illustrative example: one reviewer gives a five because the finish is acceptable, while another uses five only for an exceptional result. Averaging their numbers creates a precise-looking value from incompatible interpretations. Clear anchors and a calibration discussion make the observations more useful.

Scope and limits

Do not convert an arbitrary rating scale into a percentage improvement without justification. This guide does not prescribe a universal coating score. Use an analysis appropriate to the scale and keep the underlying observations available when the final decision depends on a small difference.

Related guidance

Ask NANOLAB about the exact product and intended use. Use the current product documentation for formulation-specific instructions.