It is really encouraging that CBT performs better than control conditions for reducing depression symptoms up to 12 months later and across many different formats and populations. CBT has been well tested for depression, and whilst there is still much room for improvement (e.g., the effect sizes are much more modest for child and adolescent trials than for trials in adults), we can be reasonably confident, given these findings, that CBT is worth investing in as a treatment approach. That said, one size doesn’t fit all, and again, it is encouraging that self-help CBT, even without human support input, was at least moderately good at reducing depression symptoms.