Using a randomized controlled design, the efficacy of a self-directed psychosocial intervention with minimal therapist contact, aimed at reducing the symptoms of adult ADHD, was examined. Following the intervention, the treatment group reported significantly reduced ADHD symptomatology; improved organizational skills; improved self esteem and better anger control, when compared to waiting list controls. Comorbid anxiety, depression, high levels of stress and learning problems, did not effect treatment outcome. Improvements in ADHD symptomatology and organizational skills were maintained at a 2-month follow-up. Although the programme was successful, close adherence to the programme was necessary for optimum treatment gains. These findings build upon an earlier study that used a more intensive form of programme delivery and support the view that psychosocial interventions can enhance daily functioning for adult ADHD.