Any procedure of combining inter- and intra-block information involves use of the ratio of the inter-block variance to the intra-block variance. Since this ratio is not known but is estimated, some loss of information is to be expected. This loss is measured here by computing actual gain over the information provided by the intra-block estimate and expressing it as a percentage of the maximum gain possible (when the ratio of variances is known). The results for four BIB designs and comments are given in Section 2.