The document discusses the evolution of technology for instruction from early tools like quill pens and slates to modern digital technologies. It describes the four phases of integrating information and communication technology (ICT) in education from emerging to transforming. Key developments discussed include the introduction of films, radio, computers, the internet, mobile devices and how each has expanded the technologies available to enhance teaching and learning. Theories and approaches that influenced educational technology are also outlined, such as behaviorism, cognitivism, constructivism and instructional design models.