As connectivity research is currently disparate due to the lack of a common theory (WG1), this will be the first point to critically review. In this context, the definition and compilation of shared protocols for measurement methods and data collection (WG2) and subsequent modelling approaches (WG3) are long overdue. The latter WGs, through model building, calibration and validation will form the basis for indices (WG4) that describe connectivity quantitatively. The Action will stimulate research on such indices by pooling different methodological approaches (sensor networks, remote sensing, geomorphometry, field surveys) and experiences. Lastly, the results of these WGs will be converted into applied science by the development of usable tools to enable sustainable land and water management (WG5).