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This tutorial is based on an analysis of the invariance of an instrument, where the questionnaire underwent various changes over the course of ten years. The recommendations thus relate primarily to this area of possible changes, but the methods suggested below can also be applied analogically to other areas (e.g. testing invariance after a change in the mode of data collection).doi:10.5281/zenodo.3874354 fatcat:63diuw6bw5e3jjhyyeq6dwncgm