The document discusses the meaning and definitions of educational technology. It outlines four revolutions in education according to Eric Ashby: 1) shift from parents to teachers as educators, 2) adoption of written word, 3) invention of printing press and books, 4) development of electronics and communication. Educational technology aims to increase learning rates by enabling teachers to teach less and learners to learn more. It involves analyzing teaching/learning processes, exploring component functions, observing effects of manipulation, and translating findings into guidelines. Educational technology can refer to mechanization of the educational process through preserving, transmitting, and advancing knowledge using tools like printing, radio, TV, and research. Overall, educational technology systematically applies scientific knowledge of learning conditions to improve teaching