This chapter presents the genesis and evolution of the public patient portal called Carpeta Personal de Salut (CPS) of Catalonia, Spain from 2008 to 2015. The CPS started as a web-browser viewer of a subset of citizens’ health data stored in the systems of the public health system, and has gradually turned into an information infrastructure as new relations with other systems, services, actors, regulations, practices, and so on, have been established. This chapter suggests how in order to cope with the conditions of indeterminacy and uncertainty characterizing the building of patient-oriented information infrastructures, designs must always be open and connectable so as to be able to respond to new possibilities.
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