Coderen voor kwaliteit : de ontwikkeling van een codeersysteem dat ACT-consistentie kan toetsen.

ACT has proven its efficacy for chronic pain. In response to growing demand for therapy over the internet, the internet-based, guided self-help intervention based on ACT, called ‘Living with Pain’ was introduced (Trompetter, Bohlmeijer, Veehof, & Schreurs, 2014). This master thesis provides a description of the development of an encoding system, that can be used to determine ACT-integrity of feedback mails from this intervention. Investigations about treatment-integrity in online-interventions are unknown, although it is an important concept and, as in face-to-face therapy, a requirement for improving outcomes, such as pain interference in daily life. Two researchers have analyzed 55 feedback emails from the online ACT-course and encoded at the sentence level. An iterative process of nine encoding sessions was needed to reach sufficient consensus, reflected in a Cohen’s Kappa-coefficient of .77. With that, they succeeded in developing a reliable encoding system. The results of this study are promising for the future, because a tool is developed that can be used for research to improve the quality and results of online interventions based on ACT.