Common factors: post hoc explanation or empirically based therapy approach?

Area of Science:

• Psychology
• Psychotherapy Research
• Evidence-Based Practice

Background:

• The common factors perspective offers a parsimonious explanation for therapeutic equivalence across different orientations in treatment outcome literature.
• Laska, Gurman, and Wampold (2014) advocate for incorporating this perspective into evidence-based practice.
• However, the extent to which a distinct 'common factors approach' exists remains a point of discussion.

Purpose of the Study:

• To comment on Laska et al.'s arguments regarding the common factors perspective in evidence-based practice.
• To clarify the application of common factors in psychotherapy process and outcome research.
• To amend the conceptualization of a 'common factors approach' within evidence-based practice.

Main Methods:

• Critical commentary on existing literature and arguments presented by Laska et al. (2014).
• Analysis of psychotherapy process and outcome research to support or amend the common factors perspective.
• Linguistic and conceptual clarification of the application of common factors in practice.

Main Results:

• Agreement with the common factors explanation for therapeutic equivalence as supported by scientific evidence.
• Disagreement with the notion of a singular, overarching

Conclusions:

• The common factors perspective is a valuable lens for understanding therapeutic equivalence.
• Clarification is needed regarding the existence and definition of a distinct 'common factors approach' in evidence-based practice.
• Further refinement of language and perspective is beneficial for applying psychotherapy research to evidence-based practice.