Engaging children in the design of digital technology is one of the core strands in Child-Computer Interaction literature. Nevertheless, only few studies explore how teenagers as a distinct user group are engaged in Participatory Design activities. Based on a case study comprising ten Participatory Design workshops with teenagers (13-15 years old) we identified a range of means that designers employed in order to engage the teenagers actively in PD: Rewards, storytelling, identification, collaboration, endorsement, technology and performance. While these means were realised through the use of well-established PD tools and techniques, a deeper understanding of teenagers’ motivation and motives is essential to understand how tools and techniques can made to support teenagers motivation. We outline a Cultural Historical Activity Theoretical approach to teenagers’ motives and motivation as a frame for understanding how various means may be employed to engage teenagers in PD activities.