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Information technologies can help cognitively impaired people in planning and memory tasks. Though many projects already address such issues, they still use standard HCI and computers. Tangible user interfaces (TUI) emerge as a new way to use a computer. They can improve the interactions and situatedness with respect to traditional HCI. In this paper, we present how we can use TUIs plan to build a cognitive assistant for activities of daily living on the form of an interactive table in a kitchen. Interactions are modelled with token and constraints paradigm (TAC), which may allow the user to have a better experience and to be more independent. We have implemented a token and constraint (TAC) layer using the capacities of object-oriented programming and XML architecture initialization.