Selecting the right team may be a first and easy way to affect firm performance for university spin-offs. On the one hand we suppose that team composition namely team homo- or heterogeneity in particular is a critical success factor for new ventures. On the other hand, we expect that success factors besides team composition are important as well, or, to be more precised more important. To shed light on these parallel effects, we emphasize this empirical study and try to determine if team composition has significant relevance in the entrepreneurial process and a deep impact on new venture success. We think that attributions of direct effects of team formation on firm performance often owe to study design and data composition. In other words, prior research disregards moderating effects between the team as success factor and other success factors. Rather, new venture success is influenced more by other success factors that are to a large extend a function of team homo- or heterogeneity.