3Urban woodland vegetation provides people with many aesthetic, ecological and psychological benefits, 4 but can also generate problems concerning people's perception of safety. This paper reviews existing 5 knowledge about perceived personal safety in relation to vegetation, particularly woodland vegetation, in 6 urban green spaces such as parks and residential areas. Individual and social factors, but also vegetation 7 character, maintenance and design, proved to be important for perceived personal safety. Vegetation- (Schroeder & Anderson, 1984;Burgess et al., 1988).

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Tree inventories are expensive to conduct and update, so every inventory carried out must be maximized. However, increasing the number of constituent parameters increases the cost of performing and updating the inventory, illustrating the need for careful parameter selection. This paper reports the results of a systematic expert rating of tree inventories aiming to quantify the relative importance of each parameter. Using the Delphi method, panels comprising city officials, arborists and academics rated a total of 148 parameters. In order of total mean score, the top ranking parameters, which can serve as a guide for decision-making at practical level and for standardization of tree inventories, were: Scientific name of the tree species and genera, Vitality, Coordinates, Hazard class and Identification number.The study also examined whether the different responsibilities and usage of urban tree databases among organizations and people engaged in urban tree inventories affected their prioritization. The results revealed noticeable dissimilarities in the ranking of parameters between the panels, underlining the need for collaboration between the research community and those commissioning, administrating and conducting inventories. Only by applying such a transdisciplinary approach to parameter selection can urban tree inventories be strengthened and made more relevant.

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