Cognitive behavioural therapies are not for everyone. Some people will have psychological disorders that require a more in-depth approach than the quick fix remedy that CBT can offer. For many people, of course, it works well and offers the desirable quick turn around. However, by focussing on thought processes, it will not be able to help people who have certain conditions for which no amount of positive thoughts or new modes of thinking could help. People who suffer from clinical depression because they have a physical imbalance of neuro-chemicals in their brain will not be suited to it, for example. Equally, various scientific research papers have said that it is not always effective in cases of schizophrenia and other serious mental disorders. In some cases, the therapy may not be as effective as patients might like simply because their therapist is insufficiently skilled or, more often, because they have not reinforced their new cognitive processes enough on their own.