||They describe the iterative design of two collaborative storytelling technologies for young children, KidPad and the Klump. They focus on the idea of designing interfaces to subtly encourage collaboration so that children are invited to discover the added benefits of working together. This idea has been motivated by our experiences of using early versions of our technologies in schools in Sweden and the UK. They compare the approach of encouraging collaboration with other approaches to synchronizing shared interfaces. They describe how we have revised the technologies to encourage collaboration and to reflect design suggestions made by the children themselves.