Effectiveness Issues for Psychotherapy

Effectiveness Issues for Psychotherapy and Group Psychotherapy
This is a Research Methods in Psychology course assignment. Major Paper assignment
which requires review of 6 article and make connection between them and write a major
paper.
I am trying to make an explanation how therapies effective to treat clients. Effectiveness
is the main point to discuss.
How we know/understand psychotherapy or/and group psychotherapy effective or not,
less or more, when and where?
Review of 6 article
6 pages long
Double space line
Font size 12 times new roman
Should be according to APA STYLE
I will add the articles.