Criticisms of ACT are just now gradually beginning to appear in published forms. The written criticisms of RFT (and to a lesser degree, functional contextualism) are extensive and in writing, as are the defenses. They can be found in the other sections of the website.
You can see various criticisms in the daughter pages below.
Part of the core of the ACT / RFT tradition is the openness to criticism, including self-criticism. At the LaSalle ACT Summer Institute (Philadelphia, 2005) James Herbert gave a really solid paper walking through many of the criticisms he knew about, under the title "Is ACT a fad?" He considers not just whether the criticisms are correct, but what those in the ACT / RFT community should do about them. You can look at that talk by clicking on the link below.
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Below is a list of papers that have been published criticizing ACT as well as replies that have been published when available. If you know of other criticisms or replies please email or add a linked sub-page to this page.
Replies to ACT criticisms