Contents: Behavioural Psychology -- Conditions and facilitators of false-belief understanding in young children; Smile asymmetries and reputation as reliable indicators of likelihood to co-operate: an evolutionary analysis; The effects of perceived maternal parenting styles on the disruptive behaviours of children with attention deficit hyperactivity disorder; Oppositional defiant disorder: mediation by hostile biased social cognitions; The role of investment in Rusbult's investment model; The assessment of dangerous behaviour. Cognitive Psychology -- Whole-reversal and partial-reversal learning in conditional discriminations are not controlled by reinforcer density; From conversation to construct: the development of legitimised aggression in the psychological domain. Biological Psychology -- Biopsychological aspects of memory and education.