More and more virtual tools are used for issues of product ergonomics and human factors in production. This article describes the use of digital human models as virtual tools used in CAx systems, PLM systems and in the digital factory. An empirical study with users of these systems shows the benefits working with these systems and the problems, which have to be solved in the future. The main question, answered by the article, is: Will virtual ergonomic tools be used by experts in the future or will these tools become a standard for constructing engineers and production planners?