Learning Objectives
- Identify the three components of getting your message across to others.
- Distinguish between the interactional models of communication and the transactional model of communication.
- Explain the three principles discussed in the dialogical theory of public speaking.

As noted earlier, all of us encounter thousands of messages in our everyday environments, so getting your idea heard above all the other ones is a constant battle. Some speakers will try gimmicks, but we strongly believe that getting your message heard depends on three fundamental components: message, skill, and passion. The first part of getting your message across is the message itself. When what you are saying is clear and coherent, people are more likely to pay attention to it. On the other hand, when a message is ambiguous, people will often stop paying attention. Our discussions in the first part of this book involve how to have clear and coherent content.
The second part of getting your message heard is having effective communication skills. You may have the best ideas in the world, but if you do not possess basic public speaking skills, you’re going to have a problem getting anyone to listen. In this book, we will address the skills you must possess to effectively communicate your ideas to others.
Lastly, if you want your message to be heard, you must communicate passion for your message. One mistake that novice public speakers make is picking topics in which they have no emotional investment. If an audience can tell that you don’t really care about your topic, they will just tune you out. Passion is the extra spark that draws people’s attention and makes them want to listen to your message.
In this section, we’re going to examine the process of public speaking by first introducing you to a basic model of public speaking and then discussing how public speaking functions as dialogue. These models will give you a basic understanding of the communication process and some challenges that you may face as a speaker.
Models of Public Speaking
A basic model of human communication is one of the first topics that most communication teachers start with in any class. For our focus on public speaking, we will introduce two widely discussed models in communication: interactional and transactional.
Interactional Model of Public Speaking
The interactional model of public speaking comes from the work of Claude Shannon and Warren Weaver (Shannon & Weaver, 1949). The original model mirrored how radio and telephone technologies functioned and consisted of three primary parts: source, channel, and receiver. The source was the part of a telephone a person spoke into, the channel was the telephone itself, and the receiver was the part of the phone where one could hear the other person. Shannon and Weaver also recognized that often there is static that interferes with listening to a telephone conversation, which they called noise.
Although there are a number of problems with applying this model to human communication, it does have some useful parallels to public speaking. In public speaking, the source is the person who is giving the speech, the channel is the speaker’s use of verbal and nonverbal communication, and the receivers are the audience members listening to the speech. As with a telephone call, a wide range of distractions (noise) can inhibit an audience member from accurately attending to a speaker’s speech. Avoiding or adapting to these types of noise is an important challenge for public speakers.
Interactional Model
The interactional model of communication developed by Wilbur Schramm builds upon the linear model (Schramm, 1954). Schramm added three major components to the Shannon and Weaver model. First, Schramm identified two basic processes of communication: encoding and decoding. Encoding is what a source does when “creating a message, adapting it to the receiver, and transmitting it across some source-selected channel” (Wrench, McCroskey & Richmond, 2008). When you are at home preparing your speech or standing in front of your classroom talking to your peers, you are participating in the encoding process.
The second major process is the decoding process, or “sensing (for example, hearing or seeing) a source’s message, interpreting the source’s message, evaluating the source’s message, and responding to the source’s message” (Wrench, McCroskey & Richmond, 2008). Decoding is relevant in the public speaking context when, as an audience member, you listen to the words of the speech, pay attention to nonverbal behaviors of the speaker, and attend to any presentation aids that the speaker uses. You must then interpret what the speaker is saying.
Although interpreting a speaker’s message may sound easy in theory, in practice many problems can arise. A speaker’s verbal message, nonverbal communication, and mediated presentation aids can all make a message either clearer or harder to understand. For example, unfamiliar vocabulary, speaking too fast or too softly, or small print on presentation aids may make it difficult for you to figure out what the speaker means. Conversely, by providing definitions of complex terms, using well-timed gestures, or displaying graphs of quantitative information, the speaker can help you interpret his or her meaning.
Once you have interpreted what the speaker is communicating, you then evaluate the message. Was it good? Do you agree or disagree with the speaker? Is a speaker’s argument logical? These are all questions that you may ask yourself when evaluating a speech.
The last part of decoding is “responding to a source’s message,” when the receiver encodes a message to send to the source. When a receiver sends a message back to a source, we call this process feedback. Schramm talks about three types of feedback: direct, moderately direct, and indirect (Schramm, 1954). The first type, direct feedback, occurs when the receiver directly talks to the source. For example, if a speech ends with a question-and-answer period, listeners will openly agree or disagree with the speaker. The second type of feedback, moderately direct, focuses on nonverbal messages sent while a source is speaking, such as audience members smiling and nodding their heads in agreement or looking at their watches or surreptitiously sending text messages during the speech. The final type of feedback, indirect, often involves a greater time gap between the actual message and the receiver’s feedback. For example, suppose you run for student body president and give speeches to a variety of groups all over campus, only to lose on student election day. Your audiences (the different groups you spoke to) have offered you indirect feedback on your message through their votes. One of the challenges you’ll face as a public speaker is how to respond effectively to audience feedback, particularly the direct and moderately direct forms of feedback you receive during your presentation.