Werner Joseph Severin has explored a wide range of communication theories through this book, and as our lives are entirely based on communication, persuasion is used daily in different forms , based on different theories, with the aim of changing our attitudes and directing them towards the desired result, which is why chapter 8 “theories of persuasion” focused on persuasion. Like being exposed to new information every day and changing our attitudes accordingly, persuasion has served its purpose. For example, if you like something and the new information you have been exposed to has changed your attitude towards it, then this is successful persuasion communication. Persuasion can affect our beliefs at will, because what you believe to be true can be changed through persuasive communication. This chapter aims to explain how persuasive communication can change attitudes. Attitudes are made up of three components: feelings, beliefs and actions, respectively affective, cognitive and behavioral. And have two structures which are an inter-attitude structure and an intra-attitude structure. While inter-attitude structure refers to the grouping of attitudes to arrive at an ideology, intra-attitude structure refers to how the components of attitudes correlate. Furthermore, the concept of attitude is one of the most indispensable and distinctive concepts in contemporary American social psychology, as described by psychologist Gordon Allport. It also reveals that the term "attitude" has replaced vague terms such as custom, feeling, instinct and social force in psychology. Additionally, research has been conducted over the years to understand attitude change. Starting with the very first study on attitude change in 1923 by Rice and Willy which found support to be middle of paper. It also showed that the active condition (writing) had a lesser effect on the resistance of beliefs to persuasion than the passive condition (reading). Another experiment examined whether refuting one set of attacks would avoid being influenced by other attacks. The results were as expected, refuting some attacks made other attacks less credible and pre-exposure to the attacks can make the person realize that their beliefs are vulnerable and need to add support. Recent studies have found that threat plays an important role in vaccination. Partly because people tend to protect their beliefs when under attack, so threat arouses people's desire to make their attitudes resistant to change. Additionally, if the problem is not major, vaccination would probably not take place. In addition, vaccination has had great success in health communication campaigns..