Field trips combine a number of favourable conditions for collaborative and situated learning. Research has shown that collaboration can be improved by the use of digital tools, such as interactive tables. However, existing tools are heavy and thus unfit for field trips. This article introduces a conceptual framework for the design of collaborative tools in a mobile context. This framework is based on three features: a shared mobile interactive display, a modular tool to support collaboration and scriptable tools to design collaborative educational scenarios. The overall objective is to provide teachers with solutions for designing field-based learning activities and to support learners' collaboration.