The findings of this study are published in: Purić, D., Petrović, M. B., Živanović, M., Lukić, P., Zupan, Z., Branković, M., Ninković, M., Lazarević, L. B., Stanković, S., & Žeželj, I. (2023). Development of a novel instrument for assessing intentional non-adherence to official medical recommendations (iNAR-12): A sequential mixed-methods study in Serbia. *BMJ Open, 13*(6), e069978. https://doi.org/10.1136/bmjopen-2022-069978. Please cite accordingly. Using the [WP2 dataset][1] obtained in the pilot study, we employed an iterative process to select the best items for both Non-adherence to official medical recommendations (NAR) practices and Traditional, complementary and alternative medicine (TCAM) practices and for use in both standard and ambulatory assessment settings. This resulted in four separate questionnaires. The final NAR and TCAM assessment tools will be used in subsequent work packages WP3 (ambulatory assessment) and WP4 (representative sample). - `NAR-12 (Serbian and English).pdf` is the final 12-item self-report instrument for assessing non-adherence to official medical recommendations which will be used in WP4. The instrument is provided in both Serbian and English. This instrument has also been deposited to the Repository of psychological instruments in Serbian (REPOPSI) - [NAR-12][2]. - `TCAM-22 (Serbian and English).pdf` is the final 22-item self-report instrument for assessing traditional, complementary and alternative medicine practices which will be used in WP4. The instrument is provided in both Serbian and English. This instrument has also been deposited to the Repository of psychological instruments in Serbian (REPOPSI) - [TCAM-22][3]. - `NAR-5-AA (Serbian and English).pdf` is the final 5-item self-report ambulatory assessment instrument for assessing non-adherence to official medical recommendations which will be used in WP3. The instrument is provided in both Serbian and English. - `TCAM-9-AA (Serbian and English).pdf` is the final 9-item self-report ambulatory assessment instrument for assessing non-adherence to official medical recommendations which will be used in WP3. The instrument is provided in both Serbian and English. [1]: https://osf.io/3fbwm/ [2]: https://osf.io/ncasm/ [3]: https://osf.io/j39gf/