four facets. In 2007, Colin DeYoung (Yale), Lena C. Quilty (CAMH) and Jordan Peterson (Toronto) concluded that the 10 aspects of the Big Five may have distinct biological substrates. This was derived through factor analyses of two data samples with the International Personality Item Pool, followed by cross-correlation with scores derived from 10 genetic factors identified as underlying the shared variance among the Revised NEO Personality Inventory facets. By 2009, personality and social psychologists generally agreed that both personal and situational variables are needed to account for human behavior. Colin G. DeYoung et al. (2016) researched the Big Five model and how the five broad factors are compatible with the 25 scales of the DSM-5's Personality Inventory (PID-5). DeYoung et al. considers the PID-5 to measure facet-level traits. Because the Big Five factors are broader than the 25 scales of the PID-5, there is disagreement in personality psychology relating to the number of factors within the Big Five. According to DeYoung et al., "the number of valid facets might be limited only by the number of traits that can be shown to have discriminant validity." A FFM-associated test was used by Cambridge Analytica, and was part of the "psychographic profiling" controversy during the 2016 US presidential election. Biological and developmental factors The factors that influence a personality are called the determinants of personality. These factors determine the traits which a person develops in the course of development from a child. Temperament vis-à-vis personality There are debates between researchers of temperament and researchers of personality as to whether or not biologically based differences define a concept of temperament or a part of personality. The presence of such differences in pre-cultural individuals (such as animals or young infants) suggests that they belong to temperament since personality is a socio-cultural concept. For this reason developmental psychologists generally interpret individual differences in children as an expression of temperament rather than personality. Some researchers argue that temperaments and personality traits are age-specific manifestations of virtually the same latent qualities. Some believe that early childhood temperaments may become adolescent and adult personality traits as individuals' basic genetic characteristics actively, reactively, and passively interact with their changing environments. Researchers of adult temperament point out that, similarly to sex, age, and mental illness, temperament is based on biochemical systems whereas personality is a product of socialization of an individual possessing these four types of features. Temperament interacts with