This study was designed to investigate the impact of Adlerian parent trainings on parenting style and perceived competence, in order to determine if Positive Discipline parent training courses promote the authoritative parenting style. It was hypothesized that an Adlerian parent training would both promote the authoritative style and reduce authoritarian style and permissive style. It was also hypothesized that after attending a parent training, parents would note an increase in their sense of competence as parents. The central constructs were assessed through an online survey that included a measure of parenting style (Parenting Styles and Dimensions Questionnaire; PSDQ) and a measure of parenting competence (Parent Sense of Competence; PSOC). The sample consisted of 101 parents who attended one of 26 distinct Positive Discipline parent training group classes offered in cities across the United States. For the study, parents were assessed for parenting style and competence before the start of the course, after they completed the course, and at a 3-month follow-up period. Results indicated that parents experienced significant increases in both authoritativeness and sense of competence from pre-test to post-test. There was an even stronger significance associated with the increase in authoritativeness from pre-test to the three-month follow-up. Results also confirmed the hypothesis that attendance at the parent training would lead to reduced levels of authoritarian and permissive parenting styles. The study provides emperical support for the theoretical link between the Adlerian parenting model and the authoritative parenting model.