Recent research has indicated that elimination of a persistent avoidance response (AR) is facilitated by an unavoidability procedure, wherein the noxious stimulus (NS) is presented on all trials whether an AR occurs or not, but it is facilitated even more by punishment wherein the NS is presented only following an AR. The unavoidability and punishment procedures were conceptualized as extremes on a continuum designated as the percentage of nonresponses followed by the NS. Thus, four groups (N = 13) of undergraduates received the NS following each AR made during the elimination phase, but they differed with respect to the percentage of nonresponses followed by the NS: 0% (punishment), 25%, 75%, and 100% (unavoidability). Several measures of performance during the elimination phase indicated significantly greater persistence as the percentage variable increased. These results were taken as supporting the original conceptualization.