Resumen en inglés

The results of a research project at the master's level are presented, carried out from a problem reflected in the teaching and learning of sciences at the basic secondary level. The objective of this research was focused on strengthening scientific competencies in the area of natural sciences in eighth grade students of the El Poblado Educational Institution, through the design and implementation of didactic guides. Taking into account that the teaching of sciences currently demands timely intervention from educational practices in order to generate alternative solutions to problems that inhibit the learning process. Methodologically, it was a qualitative type of research, framed in the interpretive paradigm and the case study approach; through data collection instruments such as observation and the diagnostic questionnaire. On the other hand, among the techniques for the analysis of the information, the software Atlas ti version 8 and the hermeneutic triangulation were implemented. Initially, a diagnostic questionnaire was applied to find out the levels of scientific competences: comprehensive use of scientific knowledge (UCC), explanation of phenomena (EF) and inquiry (IND) in the population under study. Next, a documentary analysis of the eighth grade curricular (mesh) and didactic (guides) material, sent during the Covid-19 contingency, was made. The results of the diagnosis showed low levels in the UCC and EF skills. In addition, a disarticulation of the curricular mesh and didactic guides was reflected with respect to the strengthening of scientific competences. In this sense, a didactic guide model is proposed for the promotion of UCC, EF and IND competencies, through the development of themes related to human reproduction. From this didactic strategy, significant and favorable results are evidenced in the advancement of science skills.