Various psychologists have defined traits differently over the years. Fundamentally, traits are dimensions of psychological differences among people, including cognitive abilities, information processing, worldviews, values, goals, strivings, attachment styles, hobbies, habits, behavioral tics, and more. This definition, therefore, excludes differences that are not psychological and/or stable. This definition works well with existing personality assessment frameworks. However, in practice, traits can be defined far more broadly than what these assessment tools assess, depending on what the researchers want to focus their attention on. Extraversion, conscientiousness, and agreeableness, are some examples of personality traits.