The authors present first results of the supportive research accompanying the program "SINUS in Elementary School" (German abbreviation: SGS), a program aimed to increase the efficiency of lessons in mathematics and science. In order to investigate the dimensions of the program?s efficacy, the mathematical competencies of students as well as the teachers? attitude regarding further education and cooperation at elementary schools working with SINUS were analyzed and compared to the results of the "Trends in International Mathematics and Science Study" (TIMSS) of 2011, which is representative for Germany. It was revealed that math teachers at SINUS elementary schools, in contrast to their colleagues within the framework of TIMSS, report aspects of professionalization that are closely linked to the SINUS approach. On the student level, it could be shown that the students at SINUS elementary schools achieve higher competence values in mathematics.