The res ults of a relaxation-mode analysis are prese nted for two cases of trapped-defect relaxation in t he NaC] structure, in which both defects occ upy the same type of site (e.g., impurity d ivalent ion a nd trapped vaca ncy), or in wh ich t hey occupy the two different types of sites (vaca ncy pai r). The relaxation analysis is prese nted in t he form of a set of basis vecto rs in occupation-probabili ty space and a set of secul a r equations. Soluti ons to t he eq uations provide t he relaxation rates a nd a lso the coefficie nts in t he li near combiuat ions of t he basis vecto rs whi ch constit ute the relaxation modes.Calcu lations of t he relaxation rates a nd co ntribut ions to t he pola ri zabilityof the va ri ous modes for a three-shell model with jump fr equ e ncies chosen to rep resent the relaxation of an impurity-ion vacancy pair in NaCI(Mn) have co nfirm ed t he res ul ts of Lozovs kii . Even t hough t he t hird s hell makes a signifi ca nt and even la rge co nt ri bution to t he process, one mode dominates and t he relaxation as see n in a-c mea m e me nts would ta ke place w ith esse nt ially a single relaxation t im e. Th e d-c techniques of Drey fu s a rc sensit ive eno ugh to detcct more t han one of these relaxations at low tem perat ures, but t he slowest of t hese\\ ill a lways be t he do mina nt o ne. Any relaxation 810\\'er t han t he maj or one mu st be asc ri bed to some othe l' mechan ism.