Levels of agreeableness refer to the degree to which an individual tends to be cooperative, compassionate, and trusting in their interactions with others.
This model suggests that personality can be described using five broad dimensions known as openness, conscientiousness, extraversion, agreeableness, and neuroticism.
Big Five Inventory: It is a self-report questionnaire used to measure the five dimensions (including agreeableness) of the Five-Factor Model.