This document shows the general framework within which developed the research project Design and implementation of a curriculum for the teaching of natural sciences at the basic level with a physical approach. In this project it is assumed the organization of the curriculum, the curriculum of science and its continuing restructuring as an ongoing investigative work by the group of teachers of different levels of education, in a way such that recognize the problems around teaching and learning science in the particular context of each institution, formulate and implement solution strategies and establish plans for monitoring and evaluating these processes in benefit of the formation of scientific competences.