movement is driven by vision and enabled by access. Alasdair’s work on spatial analysis constitutes the foundation of the agent model and supports research in space syntax theory. The theory was initially established by Bill Hillier and Julienne Hanson in their book The Social Logic of Space. Space syntax theory was based on a graph-based representation of the spatial network in buildings and cities and what this implies in terms of the social logic of movement and occupation. The nodes in the graph representation are namely the axial lines and convex spaces. Together with Alan Penn, David O'Sullivan and Maria Doxa, Alasdair has introduced to visibility graph analysis (VGA). A VGA is another representation of space that reflects on intervisibility relationships in a layout. In a VGA model, nodes are considered to be points in a grid that covers all spaces in a layout. Alasdair has also contributed to the development of space syntax methods. Together with Alan Penn and Bill Hillier, he has written an algorithm to generate axial maps automatically. He has also contributed to the introduction of segment graph measures and the development of geometric configurations. Segment analysis was seen by Bill Hillier and Shinichi Iida to have some explanatory power by considering angular and metric graph properties of street networks and their psychological effects. The method was mainly applied to studies on urban systems. Alasdair has written the UCL Depthmap software in which he implemented space syntax methods as well as the agent model. Alasdair's interests go beyond science and architecture towards art and generative code explorations. Being the founder of the MSc Adaptive Architecture and Computation course at UCL, he taught programming for architecture and creative design. For that, he used Processing; an open source Java-based programming language. See also Spatial network Spatial network analysis software Visibility graph analysis References External links personal Web page at the VR Centre for the Built Environment profile for the MSc Adaptive Architecture and Computation course profile for the Vision@UCL program 1969 births 2011 deaths Computer scientists Alumni of the University of Edinburgh