To adopt a user-centric approach, we investigated what specific outputs users are going to expect from the system and what data they can provide or can be automatically collected. This is coherent with the need to develop applications that are focused on users’ needs and grant more chances of adoption [3]. We conducted a round of five interviews to define the context in which the system is expected to operate, the final cost objects, and a list of activities related to a specific crop: the local production of potatoes with Protected Geographical Indication in the surroundings of Bologna, Italy. We defined with informants a list of activities to give a parsimonious representation of what the main components of variable and fixed costs are. The output of this step is a list of activities, selected according with the 5% rule: if an activity accounts for less of the 5% of the time, it is not relevant and can be aggregated to another one.
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