There has been much discussion about whether one treatment approach is better than another approach. In this chapter, we propose that the quest for the ‘best therapy’ is unlikely to provide us with the knowledge we seek. Instead, we suggest that it is better to ask ourselves why a treatment approach is effective and why certain approaches appear to work better with particular clients. We argue that this might be explained by the contextual model, which suggests that it is the similarities between treatment approaches, rather than the differences which account for successful outcomes.