Most research on perfectionism in sport, dance, and exercise continues to examine the effects of dimensions of perfectionism separately. In this chapter, we describe this independent-effects approach and revisit our previous review of research that has adopted it in sport, dance, and exercise. In doing so, we provide an updated account of the thoughts, emotions, and behaviours related to multidimensional perfectionism. In a further extension of our previous work, we also include a focus on the total unique effect of perfectionism. This is a new approach to examining the effects of multidimensional perfectionism and can be used to help determine whether, overall, perfectionism is adaptive, maladaptive, or neutral. Our updated review shows that research in this area continues to grow, most notably in sport. In addition, consistent with our previous review perfectionistic concerns and perfectionistic strivings continue to be associated with contrasting patterns of effects. In illustrating the use of total unique effects, we show for the first time that, overall, perfectionism is likely to be maladaptive in these domains, largely due to the relative influence of perfectionistic concerns.