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TACTICS (French and Spanish acronym standing for Collaborative Work and Learning in Science with Information and Communications Technologies) is an ongoing project aimed at investigating a distributed community of learning and practice in which information and communications technologies (ICT) take the role of collaborative tools to support social construction of knowledge. This community is composed of researchers, graduate students, and high-school teachers and their students, from six schools and four universities in Canada and Mexico. It set out in fall 2000 to develop a community around the general topic of integrating concepts in science school subjects. Once a \"prototype\" community is established, it can become a \"terrain\" where different aspects could be studied. Subsequently, researchers could gradually take a \"back seat\" allowing as well as ensuring the autonomy of the school members involved and, thereby, the viability of the learning community. The set up of the proposed \"prototype\" distributed science learning community was therefore an essential yet far from trivial first step. This paper discusses the process of setting up the community and the lessons learned.

To a large extent, criticisms to constructivists epistemologies, in particular to Piaget’s theory, have come from fields like psychology and didactics, not from epistemology itself. Our goal is to show that the power of piagetian theory comes from its epistemological contents. One must not look for this power in education for its own sake. This does not mean that epistemology and educational theories are unrelated but that each one has to define its domain of applicability.

En este artículo se describe una investigación cuyo objetivo es identificar las maneras en que se construye simbólicamente, mediante el lenguaje audiovisual, la idea de «la ciencia y lo científico» en el modelo mexicano de la telesecundaria. Se describen los sentidos preferentes y las tendencias de sentidos propuestas por los programas de televisión analizados, cuando se utiliza un lenguaje que integra signos lingüísticos (orales y escritos) y visual-figurativos (fijos y en movimiento). Estas construcciones simbólicas constituyen representaciones sociales de lo que la comunidad escolar considera como la ciencia y lo científico.

The different stages in the conceptual evolution of actual infinity are analyzed. We show how this concept occurs in high-school students at a prior, or at best, at the same level, as in Bernard Bolzano's conceptualization (as defined in his work The Paradoxes of Infinity). Furthermore, in terms of the historical development of the concept, the students' conceptualization has intra-objectal stage characteristics. Within the same framework, we show how Cantor's work fits into the inter-objectal stage, as well as presenting the difficulties encountered by students in order to reach this stage, given the current curricular structure. We conclude that such evidence should bring about a reconsideration of Piagetian ideas in education.