This dissertation describes an emotion knowledge intervention which was designed and conducted with four year old children with behaviour problems. The children’s parents and preschool teachers kept daily records of the children’s noncompliances to determine if there was any change in behaviour throughout the duration of the study. The children’s emotion knowledge and vocabulary ability were assessed and their parents completed a child behaviour checklist both before and after the intervention. The emotion knowledge intervention consisted of six sessions over a three week period. During the sessions the emotions angry, happy, sad and scared were discussed with the use of storybooks and games were played that involved identifying the emotions on faces of emotion cards and the children also practiced making the faces themselves. Results indicated that the intervention did not result in an increase in the children’s level of emotion knowledge or result in a change the children’s behaviour. Possible reasons for this lack of effect may have included an insufficient number of sessions to result in a change of emotion knowledge or the intervention may have been ineffective at increasing the children’s level of emotion knowledge.