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This title features papers that examine issues in digital fabrication as well as different mathematical instruments applied to architecture, including geometric tracing systems, proportional systems, descriptive geometry and correspondence analysis.

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The Winter 2012 (vol. 14 no. 3) issue of the Nexus Network Journal features seven original papers dedicated to the theme "Digital Fabrication". Digital fabrication is changing architecture in fundamental ways in every phase, from concept to artifact. Projects growing out of research in digital fabrication are dependent on software that is entirely surface-oriented in its underlying mathematics. Decisions made during design, prototyping, fabrication and assembly rely on codes, scripts, parameters, operating systems and software, creating the need for teams with multidisciplinary expertise and different skills, from IT to architecture, design, material engineering, and mathematics, among others The papers grew out of a Lisbon symposium hosted by the ISCTE-Instituto Universitario de Lisboa entitled "Digital Fabrication - A State of the Art". The issue is completed with four other research papers which address different mathematical instruments applied to architecture, including geometric tracing systems, proportional systems, descriptive geometry and correspondence analysis. The issue concludes with a book review.

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Letter from the Guest Editor.- Kim Williams: Digital Fabrication.- Alexandra Paio, Sara Eloy, Vasco Moreira Rato, Ricardo Resende Maria JoÆo de Oliveira: Prototyping Vitruvius, New Challenges: Digital Education, Research and Practice.- Kevin R. Klinger: Design-Through-Production Formulations.- Bob Sheil: Manufacturing Bespoke Architecture.- Tomas Diez: Personal Fabrication: Fab Labs as Platforms for Citizen-Based Innovation, from Microcontrollers to Cities.- Gabriela Celani: Digital Fabrication Laboratories: Pedagogy and Impacts on Architectural Education.- Tobias Bonwetsch: Robotic Assembly Processes as a Driver in Architectural Design.- Aineias Oikonomou: Design and Tracing of Post-Byzantine Churches in Northwestern Greece.- Farah Habib, Iraj Etesam, S. Hadi Ghoddusifar, Nahid Mohajeri: Correspondence Analysis: A New Method for Analyzing Qualitative Data in Architecture.- Francisco Roldán: Method of Modulation and Sizing of Historic Architecture.- Riccardo Migliari: Descriptive Geometry: From its Past to its Future.- José Pedro Sousa: Material Customization: Digital Fabrication Workshop at ISCTE/IUL.- Kim Williams: Review of Galileo´s Muse: Renaissance Mathematics and the Arts by Mark A. Peterson.

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