Keeping in mind the caveats stated in the previous section, we still may want to use the estimated variance components from the diallel model to estimate heritability. Given the family structure inherent in the diallel design, we can estimate several different heritability values, which can be interpreted as being related to response to selection among individuals, half-sib families, or fullsib families, or combined selection among and within families (Holland et al., 2003b).