The professional learning communities and communities of practice approaches in the arena of education appear to hold considerable promise for sustainable school improvement. These approaches flow from the assumption that teacher's collaboration is central to transform a school into a learning organization. They also provide opportunities for teachers' professional development. The literature shows that schools are frequently called upon to improve by developing high levels of teacher collaboration. In this study we describe how the process of building a professional learning community took place in two urban public elementary schools located in Monterrey, Mexico in which seven teachers participated, from which three were novices and four experts. Through this study, we found that teachers visualized as possible the ability to generate a space where they could reflect and solve problems while they shared experiences from their teaching practices. This space of reflection also allowed them to create projects and develop a sense of community when they had more time available since the schools were usually involved in many projects.