Book excerpt: First Published in 1987. The technical knowledge that constitutes instructional technology includes practical procedures for using existing media to deliver instruction, and also to deliver portions of instruction that supplement the communications of an instructor. Instructional technology includes practical techniques of instructional delivery that systematically aim for effective learning, whether or not they involve the use of media. It is a basic purpose of the field of instructional technology to promote and aid the application of these known and validated procedures in the design and delivery of instruction.