A further limitation is relapse rates
Although CBT is effective in tackling the symptoms of depression, there are questions of how long the benefits last
Very few early studies have looked at CBT long term effectiveness
more recent studies suggest that the long-term outcomes are not as good as what had been assumed
Study assessed depression in 439 clients every month for 12 months following a course of CBT, 42% of the clients relapse into depression within six months of ending treatment and 53% relapsed within a year
this suggests that CBT may need to be repeated periodically