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2. Biggs, M. A. R. (2002), `The Rhetoric of Research', in D. Durling and J. Shackleton (eds), Common Ground, proceedings of the Design Research Society International Conference at Brunel University, Stoke-on Trent, UK: Staffordshire University Press, pp. 111-118.
3. Biggs, M. A. R. (2006), `Necessary, Unnecessary and Sufficient Conditions', in K. Friedman, T. Love, E. Corte-Real and C. Rust (eds), Design Research Society International Conference Proceedings, Lisbon, Portugal: Centro Editorial do IADE., p. 250. Full paper online at http://www.iade.pt/drs2006/wonderground/proceedings/ fullpapers/DRS2006_0294.pdf
4. Rigor and Practice-based Research