Wolfgang Grupp considers a four-day week to be ridiculous under one condition. 45 companies nationwide are testing the model.

As part of the study, the 100:80:100 model previously used by the non-profit organization 4 Day Week will be implemented. In terms of concrete terms, this means: 100 percent working hours for the 100 percent salary with the commitment to work 100 percent of the time. The pilot project runs until August and is accompanied by scientific surveys. The evaluation and publication of the results is planned for October 2024.