CBT was originally developed for the treatment of specific psychological disorders such as depression and anxiety, for which there is robust research evidence for the efficacy of specific CBT treatment protocols for these. CBT and Person Centred Counselling (PCC) are based on different models of understanding and working with psychological issues - although they do overlap in some key ways as well.
PCC is based on the premise that when certain core conditions are present in the therapy session, clients will naturally find their own way through life challenges and psychological difficulties.
The CBT model assumes that the way we feel emotionally is caused by our interpretation of events and not necessarily the event itself. Therefore how we think directly affects how we feel (emotionally and physically) which then affects how we behave; which subsequently reinforces the thoughts and feelings. Therefore in CBT, there is a heavy emphasis on looking at and working specifically with these factors – Thoughts/Feelings/Behaviours – to then enable changes to be made where necessary.