The study examined the hypothesis that a fourth superfactor is needed to explain the space of individual differences in personality. The Eysenck Personality Questionnaire was used to assess the first three superfactors: Extraversion, Neuroticism and Psychoticism. Variance associated with these three factors was partialled out of a correlation matrix among measures from the Feelings, Reactions and Beliefs Survey, from the Study in Imagery and from measures of self-control, hope, persistence and attention control. The first principal component of the residual matrix was substantial in size and loaded measures from four different instruments, covering items with very diverse topics. The factor was interpreted as Purposefulness. Relationships with the popular “five-factor” model were explored on a subsample of 92 subjects. The model's measure of Conscientiousness had a large loading on the Purposefulness factor. In the discussion it is suggested that the factor of Purposefulness can be linked to recent theory concerning the role of deliberate practice in the acquisition of expert performance.