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Most of the existing mobile learning environments for supporting field trip activities are limited to specific domains or contents and do not support authoring. We present a framework for planning and conducting field trips with mobile devices called LEMONADE, which provides full cycle support for authoring and conducting field trips, as well as for post-trip reporting and reflection activities. LEMONADE includes a generic graph-based language for authoring field trip tasks and for querying and presenting field trip results. It is fully integrated in the graph-based modelling environment FreeStyler, allowing the students' results to be flexibly used in follow-up activities.