Teachers are affected in many ways through their interactions with others teachers – teacher networks. Teacher networks also affect the way schools respond to external changes. Thus teacher networks directly affect the educational process and are a key element of schools as social organizations. Though there is a strong conception of teachers isolated in their classrooms, there is increasing awareness that teachers learn and shape one another through professional interactions. These interactions range from informal lunch room conversations regarding classroom management to teachers providing formal professional development for each other. The interactions can affect teachers’ orientations towards teaching (e.g, extent of social distance, emphasis on progressive teaching styles etc), or subject matter knowledge or pedagogy. Teachers interact at various depths. During the school day teachers may engage in a causal conversation regarding non-professional matters or they may have several conversations of longer duration during the summer or a school retreat. While the latter type of interaction may be intuitively more substantive, it is critical to appreciate that depth of interaction occurs along a dynamic continuum; today’s casual lunch partner may be tomorrow’s trusted colleague in implementing the new reform. Social networks typically refer to the full set of relationships among a set of actors. In particular, the teacher network is more than just one-to-one teacher interaction. Thus a teacher may be influenced not just by those with whom she engages in daily interaction, but also others who she sees occasionally or even who are on the periphery of her daily social experience. Teachers’ interactions often are structured by the formal divisions in a school. For example, elementary school teachers typically interact with others who teach the same grade and high school teachers typically interact with others who teach the same subject. But there is considerable deviation from this trend, as teachers who share particular interests (e.g., technology) or who shared a common socializing experience (e.g., an awkward transition period in the school’s history) may be extremely likely to interact, even if they teach in different grades or departments. Teacher networks may also span outside the school. Teachers gain important access to new information and ideas at professional conferences, summer workshops, university based accredited training, etc. Though some of these experiences are confined to a single event, others, either by design or accident, lead to enduring relationships that supplement school-based networks. As social institutions, schools reflect their immediate community contexts, and teacher networks are no different. For example, the most active part of the network may reflect the greatest emphasis of the community, from academic subjects to vocational tracks to extracurricular activities. In turn, the student network may reflect the teacher network, as student interactions are cultivated in tracks featuring core courses or team taught courses or linked to extracurricular activities. Thus the social structure of the community is conveyed to the students partly through teacher networks. Teacher networks are not always immediately manifest. That is, on many days one may enter a school and observe little substantive interaction among teachers. But this may be deceptive. First, as stated above, even the most casual of conversations can form the basis of more in-depth relationships. Second, teachers can have strong enduring collegial relationships that are manifest only in times of urgency or extreme change. Thus two trusted colleagues may talk little in a given month but may engage in extensive conversation when considering how to implement a new reform. Teacher networks contribute to school culture in shaping how the school responds to external changes. For example, consider a school that is attempting to implement technology (technology is just one example of external changes schools face; other examples include increased emphasis on standardized tests, constructivist pedagogy, new curricular materials, changing student demographics and culture, etc.). An elementary school in which interactions are highly concentrated within grades may coordinate responses within each grade. But if there is little interaction between grades than there may be little coordination between grades, leading, for example, to the use of Windows platform in one grade and the Macintosh in another. 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