incorporate three important features that make them particularly suited for spatial analysis on urban street networks. First, they can account for both geometry and topology in input networks, using either metric distance (e.g. Meters) or topological distance (e.g. Turns) as impedance factors. Unlike previous software tools that operate with two network elements (nodes and edges), UNA tools include a third network element – buildings – that are used as the spatial units of analysis for all measures. Two neighboring buildings on the same street segments can therefore obtain different accessibility results. UNA tools optionally allow buildings to be weighted according to their particular characteristics – e.g., volume, population. More important buildings can be specified to have a stronger effect on the analysis outcomes, yielding more accurate and reliable results. The toolbox is built for easy scaling – it is equally suited for small-scale, detailed network analysis of dense urban areas and for sparser large-scale regional networks. The toolbox requires ArcGIS 10 software with an ArcGIS Network Analyst Extension. Urban Network Analysis Plugin for Rhinoceros3D – Free for both academic and commercial use. It was developed by the City Form Lab. The Rhino UNA Toolbox can be used to compute five types of graph centrality measures on spatial networks: Reach; Gravity; Betweenness; Closeness; and Straightness. The toolbox includes other spatial analysis tools, such as Closest Facility, Alternative Routes finding, pedestrian flow modeling along shortest or redundant paths, facility patronage estimation, spatial distribution of origins weights along routes etc. The tool allows users to specify which origins and destinations to use in the analysis and allows the users to weight the analysis with specific attributes of each origin and destination. The toolbox was developed to make spatial network analysis tools available to architects, designers and planners who do not have access to GIS and typically work on designs in Rhino. Having UNA metrics in Rhino, allows one to analyze how a specific spatial network performs, and to incorporate the analysis into a fast and iterative design process, where networks can be designed, evaluated and redesigned in seamless cycles. The UNA Rhino toolbox is significantly faster than its GIS counterpart, which has been available as a plugin for ArcGIS since 2012. Users have an ability to rapidly create and edit networks from any Rhino curve objects, making network design and redesign simple and intuitive. The analytic options available to the user have expanded,