Technology is usually defined as artifacts, processes and machines and the knowledge – based on technical or engineering knowledge – used to design and operate them. Technology from the sociological perspective is always a relational object because its creation, use and diffusion is based on social processes relating things, signs and meaning, humans and institutions. The former social studies of technologies (Bijker, Hugues and Pinch, 1987) concentrated on scientific knowledge and historical cases of technical innovation (electricity, nuclear power, pasteurization). The field of empirical research moved then to the study of complex interactions between societal interests and design of various technologies from cars, bicycles and missiles to medical devices and plastic materials (Bijker and Law, 1992).