Among the many challenges facing public schooling in the United States is the often irrelevant usage of technology in the classroom - in ways that support the textbook and computer industries more than student learning and achievement. This primer reframes the longstanding debate about instructional technology in school classrooms and challenges the reader to think more critically and conscientiously about the fundamental communication and technological processes that mediate learning and ultimately define education. The primer offers educators at all levels a three-dimensional map for exploring the philosophical, pedagogical, and practical uses of technology to serve rather than subvert the public purposes of education in a democracy.