The culture assimilator, a programed self-instructional approach to culture training, is described and a series of laboratory experiments and field studies validating the culture assimilator are reviewed. These studies show that the culture assimilator is an effective method of decreasing some of the stress experienced when one works with people from another culture. In general, personal adjustment and interpersonal relations in heterocultural groups are enhanced by this form of culture training. Performance measures have shown somewhat less response to assimilator training, although one field study indicates that the inclusion of task-oriented items in the assimilator may help increase productivity. (Author/RL)