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According to the renowned industry study "Hidden Champions 2020/21" by German-based scientific society WGMB, which surveyed more than 1,000 top managers, ROI-EFESO is Germany's leading consultancy in the field of Engineering & Production. In addition, ROI scored best in the categories of implementation capability and expertise among all participants. With a total of six top 5 rankings, ROI-EFESO is thus one of the most successful consulting firms in the competition. In addition to individual industries and consulting focal points, other criteria that companies apply when selecting consulting firms were examined. ROI-EFESO was the only mid-sized consulting company to achieve two number one rankings - including in the category "Implementation Capability", which was rated as the most important by those surveyed.