Rationale

Paap et al. (2022) explain that the Working Alliance Inventory (WAI) is widely used. The researcher will use it as a way to way to measure any potential pre- and post-changes in the therapeutic alliance, as reported by the client.

  

How it measures it

12 items, self-reported.

 

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Validity, Structural Validity and Reliability

Gutiérrez-Sánchez et al. (2021) reviewed various therapeutic alliance measurements and found that the WAI's internal consistency and structural validity scored as excellent, and reliability scored as good. The WAI's Cronbach's alpha was 0.89 for internal consistency, the Pearson’s r was 0.30 for reliability. Gutiérrez-Sánchez et al. (2021) concluded that the WAI is the best instrument for measuring therapeutic alliances between clients and therapists.

 

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Gutiérrez-Sánchez, D., Pérez-Cruzado, D., & Cuesta-Vargas, A. I. (2021). Systematic Review of Therapeutic Alliance Measurement Instruments in Physiotherapy. Physiotherapy Canada. Physiotherapie Canada, 73(3), 212–217. https://doi.org/10.3138/ptc-2019-0077

 

Paap, Karel, Y. H. J. M., Verhagen, A. P., Dijkstra, P. U., Geertzen, J. H. B., & Pool, G. (2022). The Working Alliance Inventory’s Measurement Properties: A Systematic Review. Frontiers in Psychology, 13.