Mikasa's advanced consolidation theory and Mikasa's method of determining c_v from the oedometer test are discussed. The latter consists of a curve rule method and correction of c_v by primary consolidation ratio, r. Theoretical time-consolidation relationships are shown for the cases of finite strain both with and without c_v change as the relation between time factor, T_v, and degree of consolidation in terms of settlement, U_s.

Examples on a clay and a peat show that the standard procedure of c_v determination using the curve rule method and correction by r gives practically the same f-c_v relationship as does the procedure based on the advanced consolidation theory, though a better curve fitting is always obtained by the latter.

Advanced consolidation theory, however, is necessary to interpret the physical meaning of consolidation test results and also to make a settlement prediction in the field.