This research is part of a doctoral training process and seeks to develop a proposal for the progressive evaluation of School Science Models (SSM). This proposal will be carried out for the teaching of stoichiometry, through the implementation of a modeling process with first year high school students in three educational institutions in the province of Concepción, Chile. To develop this research, three teachers who teach their classes through modeling processes will be invited to participate. Consensus will be established with them in relation to the modeling cycle, the progression of MCE and its corresponding evaluation. The objective is to obtain results that contribute to the dialogue and discussion around the evaluation processes present in modeling processes in the didactics of experimental sciences.