Scientific inquiry is one of the strategies that has provided some of the best results to the experimental science learning. In order to propel this kind of methodologies, in recent years, different initiatives and proposals have been performed to promote and spread this strategy. Among these proposals, the science school conferences stand out. In this manuscript, we select 168 communications presented by preschool and primary education students in order to analyze the sequence, process and methodology used in school scientific experiences. The analysis focuses on the presentations considered inquiry-based, which represent the 40% of those selected. Therefore, an analysis tool has been designed to study the processes and skills that emerge in the communicated investigations. The results show that, in general, the presented investigations have a coherent structure with this kind of methodologies. In particular, it is observed that students mainly point out the stages or aspects that are considered more descriptive (such as, the planning of their investigation) and show more difficulties to present the ideas or explanations derived from their work. At the same time, it is illustrated the school conferences functionality as a tool to exchange experiences related to the learning and teaching of science between students and teachers.