Abstract
The contribution introduces partial results of experimental computer science education on Czech grammar schools (general secondary education, students are 15-19 years old). Informatics on our grammar schools aims on user skills and misses the scientific aspects, while computer science seems to be promising regarding main educational goals on grammar schools, mainly the key competence to solve problems.
Our research is based on the idea of teaching computer science on par with traditional science subjects, such as physics or biology. We have developed an experimental course program and tested it on a group of grammar school students in Prague.
In this contribution we describe the Efficiency chapter and its educational results. If the educational goals are set appropriately, even this abstract and demanding topic can be included into grammar school curriculum.