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The viability of using the World Wide Web to collect data from three widely used instruments by clinicians and researchers was investigated. The instruments were the Inventory of Parental and Peer Attachment, the Negative Mood Regulation Scale, and the Trait Meta-Mood Scale. Data were collected from two comparable groups of college students, and differences in response patterns on paper-and-pencil and World Wide Web versions of the measures, at both the item level and scale score level, were documented. Although mode of administration effects were statistically significant, the magnitude of the effects was in general very small. The basic similarity of the properties of the measures using paper-and-pencil and online Internet modes of administration suggests the viability of the Internet for assessing these and other psychological phenomena.