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Urban design project development encompasses a wide range of disciplines andapproaches, which often have separate goals, frameworks, and software tools.Lack of timely alignment of the disconnected expert inputs to the common visionleads to an increasing number of revisions and decreases chances for finding acompromise solution. We developed an intuitive browser-supported interface inorder to incorporate various types of expert inputs and ways of representing theinformation to take a first step towards facilitating collaborative decision-makingprocesses. The current paper describes the application of the developed tool onthree exemplary case studies, where the expert and non-expert users' inputs arecombined and analysed using Grasshopper scripts at the back-end. Pilot userstudies conducted with professionals have shown that the tool has potential tofacilitate collaboration across disciplines and compromise decisions, while mostof the participants were still more likely to use it for communication withcustomers rather than the design team. It suggests that the interaction scheme ofdifferent actors with the tool needs to correspond better to the interaction ofdifferent actors during common negotiation processes. The findings suggest thatthe type of involvement of different stakeholders should be explored further inorder to find the balance in functionality suitable for different parties.