Behavior analysts have widely adopted and embraced within-subject replication through the use of reversal and multielement designs. However, the withdrawal of treatment, which is central to these designs, may not be desirable, feasible, or even ethical in practical settings. To examine this issue, we extracted 501 ABAB graphs from theses and dissertations to examine to what extent we would have reached correct or incorrect conclusions if we had based our analysis on the initial AB component only. In our first experiment, we examined the proportion of datasets for which the results of the first AB component matched the results of the subsequent phase reversals. In our second experiment, we calculated three effect size estimates for the same datasets to examine whether these measures could predict the relevance of conducting a withinsubject replication. Our analyses indicated that the initial effects were successfully replicated at least once in approximately 85% of the cases and that effect size may predict the probability of within-subject replication. Overall, our results support the rather controversial proposition that it may be possible to set threshold values of effect size above which conducting a replication could be considered unnecessary. That said, more research is needed to confirm and examine the generalizability of these results prior to recommending changes in practice.

High school sport is one of the most popular school-based extracurricular activities in North America, situated as a developmental activity during which coaches can foster quality relationships with students to promote basic psychological needs satisfaction and teach life skills. The primary purpose of the study was to examine associations between coach–athlete relationships, basic psychological needs satisfaction and thwarting, and the teaching of life skills in Canadian high school sport. The secondary purpose consisted of addressing the psychometric properties of the scales employed in the study, namely the Coach–Athlete Relationship Questionnaire, the self-report version of the Interpersonal Behaviors Questionnaire, and a modified coach version of the Life Skills Scale for Sport. The sample was comprised of 1238 (58.8% male) Canadian high school coaches and the data were analysed using structural equation modelling. The mediated model indicated that coaches' perceptions of their interpersonal behaviours satisfying athletes' basic psychological needs either fully or partially mediated the positive relationships between coach–athlete relationships and the teaching of life skills. Coach–athlete relationships, particularly those within which coaches exhibit interpersonal behaviours that satisfy athletes' basic psychological needs, appear to be associated with the teaching of life skills in the context of high school sport.

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