<human>:  How many clusters are there in the Big Five Personality cluster list–revised?
<bot>: There are five clusters. The first cluster is called “Openness to Experience”, and it includes traits such as creativity, imagination, and curiosity. The second cluster is called “Conscientiousness”, and it includes traits such as self-discipline, organization, and dutifulness. The third cluster is called “Agreeableness”, and it includes traits such as kindness, trustworthiness, and altruism. The fourth cluster is called “Extraversion”, and it includes traits such as assertiveness, activity, and sociability. The fifth cluster is called “Neuroticism”, and it includes traits such as