Data provide evidence for the Dodo bird verdict. Generally speaking, common factors are responsible for patient improvement instead of any component of a specific treatment. Researchers such as Wampold and Luborsky continue to support this claim in recent articles published in "the Behavioral Therapist". Wampold "et al." 2010 refutes claims made by Siev "et al." 2009 that Wampold 2009 made errors in research. Wampold "et al." 2009, suggests that people need to "accept the importance of the alliance and therapists and remain committed to developing and improving treatments." Wampold continues by saying that techniques could be beneficial in psychotherapy because they are the easiest variables to manipulate. These variables can act to change alliance and other common factors. Common factors can then be closely monitored and carefully distributed to patients via the therapist.