A group of 20 subjects learned sentences that contained associatively related words while another group of 20 subjects learned low association sentences. The probability of a transitional error was used as a measure of the tendency to integrate the words within the sentences into phrase units. The results suggest that phrase structures may have contributed to the organization of low association sentences for recall, but there was no evidence to suggest a similar process for high association sentences. For both between- and within-phrase transitions, the probability of a transitional error was greater for low association than for high association sentences. (Author/JD)