What is the difference between a personality test and a behaviour test?

A personality test, such as the Big Five personality test, examines stable traits that determine how a person thinks, feels, and reacts in different situations. A behaviour test, such as the PACS four-colour personality test, focuses on observable behaviour and communication style in practice.

In short: personality explains why someone does something, while behaviour tests show how someone does it. Together, they provide a complete and practical picture of how a person functions.