(3) The essence of the third stage of our design-based research was evaluation and testing our solution in practice in schools. The PROFILES modules contain all the IBSE components for gifted students. These modules were validated in the years 2012-2013 by fifty teachers in fifty classrooms in the Czech Republic. In these classes 45 students gifted in science were present. As an example, here is the most popular IBSE component – experimenting: IBSE is based on experimentation, which has a decisive role in science education (Trna & Trnova, 2012). The motivational and developmental role of experiments for students gifted in science is in line with the importance of experiments in science research (Trna, 2012) and the cognitive importance of experiments in science education (Haury & Rillero, 1994). We present as an example a learning task with an experiment (the fourth open level) from the module: “Safe swimming and diving” (See Figure 2.)