As a relatively new field of research, positive psychology lacked a common vocabulary for discussing measurable positive traits before 2004. Traditional psychology benefited from the creation of
DSM, as it provided researchers and clinicians with the same set of language from which they could talk about the negative. As a first step in remedying this disparity between tradition and positive psychology, Peterson and Seligman set out to identify, organize, and measure character. They began by defining the notion of character as traits that are possessed by an individual and are stable over time, but can still be impacted by setting and thus are subject to change. They brainstormed with a group of noted positive psychology scholars. They examined ancient cultures (including their religions, politics, education, and philosophies) for information about how people in the past construed human virtue. The researchers looked for virtues that were present across cultures and time. Six core virtues emerged from their analysis: courage, justice, humanity, temperance, transcendence, and wisdom. Next, Peterson and Seligman proposed a model of classification. The hierarchical system is modeled after the
Linnaean classification of species, which ranges from a specific species to more general and broad categories. The six core values are the broadest category and are, "core characteristics valued by moral philosophers and religious thinkers". Peterson and Seligman then moved down the hierarchy to identify character strengths, which are "the psychological processes or mechanisms that define the virtues". The researchers began identifying individual character strengths by brainstorming with a group of noted positive psychology scholars. Peterson and Seligman then performed an exhaustive literature search for work that directly addresses good character in the domains of, "psychiatry, youth development, philosophy, and psychology". Some individuals who influenced Peterson's and Seligman's choice of strengths include:
Abraham Maslow,
Erik Erikson, Ellen Greenberger,
Marie Jahoda, Carol Ryff, Michael Cawley,
Howard Gardner, and
Shalom Schwartz. The researchers also looked for virtue-laden messages in popular culture. For example, the researchers examined Hallmark greeting cards, personal ads, graffiti, bumper stickers, and profiles of Pokémon characters. After identifying dozens of "candidate strengths", the researchers refined their list by subjecting them to a list of ten criteria to help them select the final 24 strengths for the
CSV. Approximately half of the strengths included in the
CSV meet all ten criteria, and half do not. By looking for similarities between candidate strengths, the researchers distributed 24 character strengths between six virtue categories. After creating this
a priori organization of traits, the researchers performed, "an exploratory factor analysis of scale scores using varimax rotation," from which five factors emerged. Peterson and Seligman state that they are not as concerned with how the 24 strengths are grouped into virtue clusters because, in the end, these traits are mixed together to form the character of a person. == Validity and reliability ==