Final answer:
Humanistic psychologists often assessed personality by a)asking people to fill out questionnaires that would evaluate their self-concept.
Step-by-step explanation:
Humanistic psychologists often assessed personality by asking people to fill out questionnaires that would evaluate their self-concept. These questionnaires provide individuals with the opportunity to reflect on their own thoughts, experiences, and beliefs in order to gain insight into their personality traits and characteristics. Self-report inventories, such as the Minnesota Multiphasic Personality Inventory (MMPI) and the Myers-Briggs Type Indicator (MBTI), are commonly used in this assessment method.