Gajo Petrović’s textbook Logic stimulates the discussion on the need that Logic should continue to be an independent school course, represented in the curriculum of every type of high school. The reason is that logic enables the foundation and revealing of the thought, which is the base for merit response to philosophical and scientific questions. In connection to the synthesis of thought and its object, emerges the possibility of correlation between course material of logics and those of other philosophical and scientific disciplines. The traditional and modern logic (where the term modern is historically problematic) should be examined in their interrelations given the fact that each of them posses its (didactic) value. Despite the tendency of suppressing the traditional themes from teaching of logic, the actuality of Petrović’s Logic is unquestionable and it should be a part of curriculum.