The document discusses teaching tactics and their relationship to learning structures. It defines teaching tactics as the methods teachers use to make content easy to understand and help knowledge stick. Tactics are more flexible than strategies and can be used across multiple strategies. The key learning structures discussed are chain, concept, and principle learning. For chain learning, progressive, rote, and retrogressive chain tactics are outlined. Concept learning tactics involve generalization within a concept and discrimination between concepts. Choosing the appropriate tactic depends on analyzing the structure of the content being taught.