Effects of Pivotal Response Treatment for children with autism (Manon de Korte) Detection of autism in childhood (Maarten van ‘t Hof) Autism at very early age: Studies on screening in the general population and follow-up of high-risk children (Karin Beuker) Repetitive behaviour in autism: imaging pathways and trajectories (Marieke Langen) The hyperserotonaemia of Autism Spectrum Disorders (Erik Mulder) Behavioural and cognitive profiling in ASD and ADHD (Jolanda van der Meer) Exploring the labyrinth of the brain: Neurobiological parameters in Multiple Complex Developmental Disorder, a subtype of the Pervasive Developmental Disorder-Not Otherwise Specified (Bertine Lahuis) Stop hurting start helping: Empathy in children with disruptive behaviour, attention-deficit and autism spectrum disorders (Peter Deschamps) Autism Spectrum Disorders in Early Childhood: Presentation, risk factors and trajectories (Janne Visser) Toddlers with autism. Aspects of early detection, diagnosis and intervention (Iris Servatius-Oosterling) The Friesland study: pervasive developmental disorders in mental retardation (Annelies de Bildt)