The dissociation of dislocations in the NaCl structure is discussed in terms of Fontaine's model. There are no well-defined partials in the dissociation of the Burgers vector a/2 [110] on the (1[MATH]0) slip plane. The stacking fault on this plane is connected with a dilatation normal to (1[MATH]0). This leads to an unique effect of hydrostatic pressure on the frequency of cross slip. Cross slip in stage III occurs via the {111} and {001} planes. On the {001} plane dislocations are not dissociated while dissociation on {111} probably is intermediate. On {001} and {111} planes edge dislocations interact strongly with multivalent impurities while screw dislocations move relatively freely. This strong electrostatic interaction is thought to be responsible for the choice of slip plane and for the unusually strong latent hardening observed in the NaCl structure. The dissociation of dislocations on the other hand appears to influence dislocation climb and creep determined by climb