This document discusses alternative delivery systems (ADS) that can be used in education. It provides examples of different types of ADS including distance learning, broadcast radio, audio teleconferencing, and online technologies. The document discusses both the advantages and disadvantages of some of these delivery systems. For example, it notes that distance learning provides flexibility but may lack social interaction, and that radio news is accessible but fleeting. The document also includes examples of learning activities where students would explore and experience different ADS, such as simulating learning through an ADS or creating a learning program for students using ADS.