The document discusses concepts of communication including definitions from Aristotle and Edger dale. It describes communication cycles having four components: a sender, message, medium, and receiver. The steps of communication are listed as ideation, encoding, transmission, decoding, and response. Types of communication include speaking, writing, and visualizing. Classroom interaction and interaction analysis are introduced, with Flanders's interaction analysis category system described as a process to observe and categorize teaching and learning patterns. The 10 categories of Flanders's interaction analysis are defined.