Pinto, HelderJosé, RuiChambel, Teresa and Nunes, Nuno and Romao, Teresa and Creissac Campos, José2021-11-032021-11-032021978-3-03868-167-0https://doi.org/10.2312/pt.20061556https://diglib.eg.org:443/handle/10.2312/pt20061556This paper describes a ubiquitous computing framework for supporting activities that are strongly associated to a specific physical environment and that are performed by occasional visitors. Our framework implements an activity-centered approach to ubiquitous computing, by defining a conceptual model inspired by Activity Theory and implementing a software infrastructure derived from this conceptual model. The framework has been evaluated from the user view-point by experiments run at different public spaces. We are proposing to perform an additional experiment with the framework, providing user assistance to Interacção 2006 participants and organizers.Ubiquitous computing frameworksactivitycentered computing10.2312/pt.20061556221-224