Primary Outcome: Normalization
On average, service providers (n=456) scored normalization of the iCBT service slightly above neutral both during IAU (meanUsing the LMM, we found that overall and at the end of the study period, the ItFits-toolkit had a small positive statistically significant effect on normalization levels (meanMean Normalization Measure Development (NoMAD) score per mental health service delivery organization across time. IAU: implementation-as-usual; ItFits-toolkit: Integrated Theory-based Framework for Implementation Tailoring Strategies toolkit.