This is the concluding part of a short introduction to multipulse NMR. The product operator formalism considered in Parts I and II (Concepts Magn. Reson., 1996, 8, 17-32; 1997, 9,117-137) is applied to the description of the INADEQUATE (incredible natural-abundance double-quantum experiment) pulse sequence. The basic one-dimensional INADEQUATE pulse technique, two-dimensional and selective modifications of this method, and the INADEQUATE with composite-refocusing pulse train are discussed.