MKT.1:6 - Bias-Annotation
A successful reference customer can become an unjustified model for everyone. Inspect both the conditions that enabled the success and a nearby case that lacks them. A sales database also contains the people the organisation happened to reach; it need not represent those who stayed with another solution or could not get access.
Descriptive categories can become stereotypes when inferred characteristics replace actual evidence. Use a category to locate a question, and confirm the condition before relying on it for a consequential individual offer.