According to Allport, personality is the dynamic organization within an individual that determines their unique adjustment to their environment. Personality is influenced by biological, psychological, and environmental factors. Personality tests consist of standardized tasks to determine aspects of personality or identify disorders. One example is the Eysenck Personality Questionnaire which measures traits like introversion and extraversion. Personality assessments can be used for candidate evaluation, pre-employment screening, leadership development, and team building.