An anomaly as banal as a right incomplete block, admittedly atypical, could predict the occurrence of a sudden death.

The choice of a variance balanced design (Williams’ Design) or separate incomplete block design should be justified.

The choice of a variance balanced design (Williams’ Design) or separate incomplete block design should be justified.

In this paper Kiefer generalised the notions of a balanced incomplete block design and a Youden square, to the balanced block design and generalized Youden square.