The research study of the implementation of the philosophy of the competency approach which was carried out in all school curricula; especially the curriculum related to life and earth science, at different levels in the public middle and high schools in Morocco. This has shown significant findings after studying and analyzing the data questionnaire that has been handed out to both public middle and high school teachers in the country. We came to the following findings: - Teachers' work revolves around the implementation of cultural and systematic and technological competency according to the specificity of the subject and the nature of various scientific approaches. - Due to the prevalence of passive classroom practices, teachers find it difficult to help improve the learner's communicative competencies. - It is hard to carry out strategic competency since the learning conditions and the teaching environment are not suitable neither for school planning, school excursions nor pedagogical projects. - The learner's acquisition of the five competencies has undergone some difficulties. First, the nature of the subject "Sciences of Life and Earth" which is taught at both middle and high school. Second, the class sizes which cannot accommodate a huge numbers of students and as a result, classes are bound to be canceled due to the cancellation of class grouping.