Examined multitrial free recall and subjective organization of 1,005 undergraduates. Ss recalled 1 of 48 lists of 16 unrelated words of high, low, or mixed word frequencies. Recall was greater for high- than for low-word-frequency lists, but no performance differences were found in subjective organization. Analyses of the kinds of subjective organization units employed and their frequencies of usage provided evidence that some subjective organization units occur frequently and should be amenable to classification.