Social comparisons play a decisive role in the development of area-specific self-concepts and self-efficacy beliefs and those concepts are predictive for future performance. The selective accessibility model (Mussweiler, 2003a) postulates that comparison activated selective knowledge about oneself depends on the perceived similarity of a standard. This activated knowledge determines if someone is assimilating the self-evaluation towards the comparison target or contrasts it. The assumption that information of social comparison depends on the comparison focus (i.e. focus on differences or on similarities) is influencing technical self-concept, self-efficacy, and technical performance in the same way as it influences self-evaluation was tested. During an online-study first the comparison focus (similarity or difference) was manipulated through a priming task. By way of comparison people had to read an interview about a technically competent or less competent comparison target. Subsequently, participants completed assessments about the technical self-concept, self-efficacy, and technical performance. The analysis comprised data from 393 participants (265 women, 128 men). The results suggest that the level of the technical self-concept, self-efficacy, and performance depends on the perceived competence of the comparison target in combination with the perceived similarity to this target. However, a causal relationship could not be confirmed. Gender differences for technical self-concept, self-efficacy and performance were significant. Additional analysis suggests that gender stereotypes were activated through the technical topic of the study. So, maybe the comparison targets acted differently to the technical self-concept and self-efficacy of men and women, because of the gender stereotype threat.