This paper discusses design iterations of Mobile Stories – a mobile technology that empowers children to collaboratively read and create stories. We present the design and discuss the impact of different collocated collaborative configurations for mobile devices including: content splitting and space sharing. We share design experiences that illustrate how Mobile Stories supports collaboration and mobility, and identify how the collocated collaborative configurations are best suited for reading and sharing tasks. We also identify how creative tasks foster more mobility and dynamic interactions between collaborators. General Terms Design, Experimentation, Human Factors Author Keywords Children, mobile devices, collaboration, collaborative configurations, constructionism, narrative systems, stories, user interfaces ACM Classification Keywords H.5.3 [Group and Organization Interfaces]: Collaborative computing; H.5.2 [User Interfaces]: Interaction styles, prototyping, user-centered desi...