Technology is increasingly subject of attention from philosophers. Philosophical reflection on technology exhibits a wide and at times bewildering array of approaches and modes of thought. This volume brings to light the development of three schools in the philosophy of technology. Based on thorough introductions to Karl Marx', Martin Heidegger's and John Dewey's thought about technology, the volume offers an in-depth account of the way thinkers in the critical, the phenomenological and the pragmatic schools have respond to issues and challenges raised by the works of the founders of these schools. Technologies in almost any aspect of human life is potentially subject of philosophical treatment. To offer a focused demonstration of key arguments and insights, the presentation of each school is concluded with a contribution to discussions of educational technologies. In addition to philosophers seeking a valuable and clear structuring of a still burgeoning field, the volume is of interest to those working with educational philosophy and value sensitive design.