Assessing beam designs for neutron capture therapy (NCT) facilities requires accurate methods for evaluating absorbed dose and relative biological effectiveness (RBE) dose in calculated and experimental phantoms. One method that the authors have used in the past for this purpose is the use of figures of merit' (FOMs), specifically, advantage depth (AD), advantage ratio (AR), and advantage depth dose rate (ADDR). In this paper, they contend that more detail is required for evaluating absorbed dose and RBE dose in beam design studies, and instead of FOMs recommend the use of components of absorbed dose in the form of isodose contours, and dose values and therapeutic gains (TGs) at specified locations on standard phantoms.