210 CHaPtEr 27 The User-Derived Interface (UDI) FURTHER READING For a discussion of the UDI philosophy, method, and application to command languages, see Good, M. D., Whiteside, J. A., Wixon, D. R., and Jones, S. J. Building a user-derived interface. Communications of the ACM, 1984, 27(10), 1032­1043, available through the ACM digital library: http://portal.acm.org/citation.cfm?id358274.358284&collACM&dlACM&CFID10 3583941&CFTOKEN45376533. For a discussion of the UDI as applied to gestural systems, take a look at Friebrink, R. D., and Morris, M. M. Dynamic mapping of physical controls for table- top groupware. CHI 2009, Boston, MA, 471­480. Available from the ACM Digital Library: http:// delivery.acm.org/10.1145/1520000/1518778/p471-fiebrink.pdf?key11518778&key25241883 821&collACM&dlACM&CFID103583941&CFTOKEN45376533. Jacob O. Wobbrock, Meredith Ringel Morris, and Andrew D. Wilson. 2009. User-defined ges- tures for surface computing. In Proceedings of the 27th international conference on Human factors in computing systems (CHI `09). ACM, New York, NY, USA, 1083-1092. DOI=10.1145/1518701.1518866 http://doi.acm.org/10.1145/1518701.1518866