The aim of this Data Collection mechanism (DCM) is to support the data collection activity in the DELTA project. All data and information will be stored into a structured Knowledge base which will then be used for the classification of cities and mobility schemes, as well as the definition of a Decision Support Instrument (DSI). The DCM includes information about the type and structure of the selected variables (the data and information to be collected), the data templates, the validation of the variables, the data sources, and the data collection process.