The use of a variety of techniques is shown to lead to a better understanding of the study. The development of random effects models is outlined and the potential importance of block-treatment interactions is highlighted. In this paper, a more comprehensive analysis of this study is presented, informed by the recognition that the study can also be regarded as a two-phase design. However, their analysis did not take full account of all error terms. They presented an example of a study in which medical practitioners, trained in different ways, evaluated a series of videos of patients obtained under a variety of conditions. In a 2003 publication, Farewell and Herzberg presented an analysis of variance structure for such designs. Plaid designs are characterised by having one set of treatments applied to rows and another set of treatments applied to columns.
