The current article examines patterns of adult responding to different types of more-than and less-than relations, as well as procedures for facilitating responding in accordance with these relations. Using parameters suggested in the three-term series literature, the more-than and less-than relations were separated into six distinct trial types. Systematic comparisons were then drawn between repeated test exposures, the provision of automated feedback, and the presentation of nonarbitrary trials. The results showed that feedback was the most effective intervention for facilitating responding to the target relations. When feedback and nonarbitrary trials were combined, their impact was only marginally better than either intervention alone. These findings are discussed in terms of relational frame theory and interventions for remediating deficits in derived relational responding. the concept of emergent stimulus relations has been of interest to behavior analysts for over 30 years (e.g., Sidman, 1971). this interest has led to the development of a number of theoretical approaches that offer different definitions of stimulus relations and different accounts of how they emerge naturally or how they can be established for purposes of experimentation or interventions. For example, Sidman (1994) offered a mathematical set theory of stimulus equivalence in terms of reflexivity, symmetry, and transitivity. in contrast, with relational frame theory (rFt), the multiple types of stimulus relations (beyond equivalence per se) were of more concern, and the role of multiple exemplar training has been emphasized in their development or establishment (Hayes, Barnes-Holmes, & roche, 2001).