1. Introduction
Experimental design is the cornerstone of sensory analysis. The development of Latin square and complete-block designs for sensory and consumer evaluation date back at least as far as Ferris (1957). However, the majority of literary contributions in this area are based on the earlier work of Williams (1949) and the more recent paper by MacFie et al. (1989). Since MacFie et al. (1989), work on developing other types of experimental designs for sensory analysis has flourished. Wakeling and MacFie (1995) extended the results of Williams (1949) to situations where only a subset of treatments can be provided to each experimental unit. Ball (1997) developed incomplete-block designs that are balanced for carry-over effects. Deppe et al. (2001) provided a procedure for constructing nested incomplete-block designs. Kunert and Sailer (2007) discussed the development of generalized Youden designs, where the experimental units are randomized.