The transmission model of communication describes communication as a linear, one-way process in which a sender intentionally transmits a message to a receiver^[1]. This model focuses on the sender and message within a communication encounter. Although the receiver is included in the model, this role is viewed as more of a target or end point rather than part of an ongoing process. We are left to presume that the receiver either successfully receives and understands the message or does not. The scholars who designed this model extended on a linear model proposed by Aristotle centuries before that included a speaker, message, and hearer. They were also influenced by the advent and spread of new communication technologies of the time such as telegraphy and radio, and you can probably see these technical influences within the model^[2]. Think of how a radio message is sent from a person in the radio studio to you listening in your car. The sender is the radio announcer who encodes a verbal message that is transmitted by a radio tower through electromagnetic waves (the channel) and eventually reaches your (the receiver’s) ears via an antenna and speakers in order to be decoded. The radio announcer doesn’t really know if you receive his or her message or not, but if the equipment is working and the channel is free of static, then there is a good chance that the message was successfully received.

Since this model is sender and message-focused, responsibility is put on the sender to help ensure the message is successfully conveyed. This model emphasizes clarity and effectiveness, but it also acknowledges that there are barriers to effective communication. Noise is anything that interferes with a message being sent between participants in a communication encounter. Even if a speaker sends a clear message, noise may interfere with a message being accurately received and decoded. The transmission model of communication accounts for environmental and semantic noise. Environmental noise is any physical noise present in a communication encounter. Other people talking in a crowded diner could interfere with your ability to transmit a message and have it successfully decoded. While environmental noise interferes with the transmission of the message, semantic noise refers to noise that occurs in the encoding and decoding process when participants do not understand a symbol. To use a technical example, FM antennae can’t decode AM radio signals and vice versa. Likewise, most French speakers can’t decode Swedish and vice versa. Semantic noise can also interfere with communication between people speaking the same language because many words have multiple or unfamiliar meanings.

Although the transmission model may seem simple or even underdeveloped to us today, the creation of this model allowed scholars to examine the communication process in new ways, which eventually led to more complex models and theories of communication that we will discuss in more detail later. This model is not quite rich enough to capture dynamic face-to-face interactions, but there are instances in which communication is one-way and linear, especially computer-mediated communication (CMC). As the following “Getting Plugged In” box explains, CMC is integrated into many aspects of our lives now and has opened up new ways of communicating and brought some new challenges. Think of text messaging for example. The transmission model of communication is well suited for describing the act of text messaging since the sender isn’t sure that the meaning was effectively conveyed or that the message was received at all. Noise can also interfere with the transmission of a text. If you use an abbreviation the receiver doesn’t know or the phone autocorrects to something completely different from what you meant, then semantic noise has interfered with the message transmission. I enjoy bargain hunting at thrift stores, so I just recently sent a text to a friend asking if she wanted to go thrifting over the weekend. After she replied with “What?!?” I reviewed my text and saw that my “smart” phone had autocorrected thrifting to thrusting! You have likely experienced similar problems with text messaging, and a quick Google search for examples of text messages made funny or embarrassing by the autocorrect feature proves that many others do, too.

The interaction model is also less message-focused and more interaction-focused. While the transmission model focused on how a message was transmitted and whether or not it was received, the interaction model is more concerned with the communication process itself. In fact, this model acknowledges that there are so many messages being sent at one time that many of them may not even be received. Some messages are also unintentionally sent. Therefore, communication isn’t judged effective or ineffective in this model based on whether or not a single message was successfully transmitted and received.

The interaction model takes physical and psychological context into account. Physical context includes the environmental factors in a communication encounter. The size, layout, temperature, and lighting of a space influence our communication. Imagine the different physical contexts in which job interviews take place and how that may affect your communication. I have had job interviews on a sofa in a comfortable office, sitting around a large conference table, and even once in an auditorium where I was positioned on the stage facing about twenty potential colleagues seated in the audience. I’ve also been walked around campus to interview with various people in temperatures below zero degrees. Although I was a little chilly when I got to each separate interview, it wasn’t too difficult to warm up and go on with the interview. During a job interview in Puerto Rico, however, walking around outside wearing a suit in near 90-degree temperatures created a sweating situation that wasn’t pleasant to try to communicate through. Whether it’s the size of the room, the temperature, or other environmental factors, it’s important to consider the role that physical context plays in our communication.

Psychological context includes the mental and emotional factors in a communication encounter. Stress, anxiety, and emotions are just some examples of psychological influences that can affect our communication. I recently found out some troubling news a few hours before a big public presentation. It was challenging to try to communicate because the psychological noise triggered by the stressful news kept intruding into my other thoughts. Seemingly positive psychological states, like experiencing the emotion of love, can also affect communication. During the initial stages of a romantic relationship, individuals may be so “love-struck” that they don’t see incompatible personality traits or don’t negatively evaluate behaviors they might otherwise find off-putting. Feedback and context help make the interaction model a more useful illustration of the communication process. Still, the transaction model views communication as a powerful tool that shapes our realities beyond individual communication encounters.

As the study of communication progressed, models expanded to account for more of the communication process. Many scholars view communication as more than a process that is used to carry on conversations and convey meaning. We don’t send messages like computers, and we don’t neatly alternate between the roles of sender and receiver as an interaction unfolds. We also can’t consciously decide to stop communicating because communication is more than sending and receiving messages. The transaction model differs from the transmission and interaction models in significant ways, including the conceptualization of communication, the role of sender and receiver, and the role of context^[5].

To review, each model incorporates a different understanding of what communication is and what communication does. The transmission model views communication as a thing, like an information packet, that is sent from one place to another. From this view, communication is defined as sending and receiving messages. The interaction model views communication as an interaction in which a message is sent and then followed by a reaction (feedback), which is then followed by another reaction, and so on. From this view, communication is defined as producing conversations and interactions within physical and psychological contexts. The transaction model views communication as integrated into our social realities in such a way that it helps us not only understand them but also create and change them.

The transaction model of communication describes communication as a process in which communicators generate social realities within social, relational, and cultural contexts. In this model, we don’t just communicate to exchange messages; we communicate to create relationships, form intercultural alliances, shape our self-concepts, and engage with others in dialogue to create communities. In short, we don’t communicate about our realities; communication helps to construct our realities.

The roles of sender and receiver in the transaction model of communication differ significantly from the other models. Instead of labeling participants as senders and receivers, the people in a communication encounter are referred to as communicators. Unlike the interaction model, which suggests that participants alternate positions as sender and receiver, the transaction model suggests that we are simultaneously senders and receivers. For example, on a first date, as you send verbal messages about your interests and background, your date reacts nonverbally. You don’t wait until you are done sending your verbal message to start receiving and decoding the nonverbal messages of your date. Instead, you are simultaneously sending your verbal message and receiving your date’s nonverbal messages. This is an important addition to the model because it allows us to understand how we are able to adapt our communication—for example, a verbal message—in the middle of sending it based on the communication we are simultaneously receiving from our communication partner.

The transaction model also includes a more complex understanding of context. The interaction model portrays context as physical and psychological influences that enhance or impede communication. While these contexts are important, they focus on message transmission and reception. Since the transaction model of communication views communication as a force that shapes our realities before and after specific interactions occur, it must account for contextual influences outside of a single interaction. To do this, the transaction model considers how social, relational, and cultural contexts frame and influence our communication encounters.

Social context refers to the stated rules or unstated norms that guide communication. As we are socialized into our various communities, we learn rules and implicitly pick up on norms for communicating. Some common rules that influence social contexts include: don’t lie to people, don’t interrupt people, don’t pass people in line, greet people when they greet you, thank people when they pay you a compliment, and so on. Parents and teachers often explicitly convey these rules to their children or students. Rules may be stated over and over, and there may be punishment for not following them.

Norms are social conventions that we pick up on through observation, practice, and trial and error. We may not even know we are breaking a social norm until we notice people looking at us strangely or someone corrects or teases us. For example, as a new employee you may over- or underdress for the company’s holiday party because you don’t know the norm for formality. Although there probably isn’t a stated rule about how to dress at the holiday party, you will notice your error without someone having to point it out, and you will likely not deviate from the norm again in order to save yourself any potential embarrassment. Even though breaking social norms doesn’t result in the formal punishment that might be a consequence of breaking a social rule, the social awkwardness we feel when we violate social norms is usually enough to teach us that these norms are powerful even though they aren’t made explicit like rules. Norms even have the power to override social rules in some situations. To go back to the examples of common social rules mentioned before, we may break the rule about not lying if the lie is meant to save someone from feeling hurt. We often interrupt close friends when we’re having an exciting conversation, but we wouldn’t be as likely to interrupt a professor while they are lecturing. Since norms and rules vary among people and cultures, relational and cultural contexts are also included in the transaction model in order to help us understand the multiple contexts that influence our communication.

Relational context includes the previous interpersonal history and type of relationship we have with a person. We communicate differently with someone we just met versus someone we’ve known for a long time. Initial interactions with people tend to be more highly scripted and governed by established norms and rules, but when we have an established relational context, we may be able to bend or break social norms and rules more easily. For example, you would likely follow social norms of politeness and attentiveness and might spend the whole day cleaning the house for the first time you invite your new neighbors to visit. Once the neighbors are in your house, you may also make them the center of your attention during their visit. If you end up becoming friends with your neighbors and establishing a relational context, you might not think as much about having everything cleaned and prepared or even giving them your full attention during later visits. Since communication norms and rules also vary based on the type of relationship people have, relationship type is also included in relational context. For example, there are certain communication rules and norms that apply to a supervisor-supervisee relationship that don’t apply to a brother-sister relationship and vice versa. Just as social norms and relational history influence how we communicate, so does culture.

Cultural context includes various aspects of identities such as race, gender, nationality, ethnicity, sexual orientation, class, and ability. Whether we are aware of it or not, we all have multiple cultural identities that influence our communication. Some people, especially those with identities that have been historically marginalized, are regularly aware of how their cultural identities influence their communication and influence how others communicate with them. Conversely, people with identities that are dominant or in the majority may rarely, if ever, think about the role their cultural identities play in their communication.

When cultural context comes to the forefront of a communication encounter, it can be difficult to manage. Since intercultural communication creates uncertainty, it can deter people from communicating across cultures or lead people to view intercultural communication as negative. But if you avoid communicating across cultural identities, you will likely not get more comfortable or competent as a communicator. Difference isn’t a bad thing. In fact, intercultural communication has the potential to enrich various aspects of our lives. In order to communicate well within various cultural contexts, it is important to keep an open mind and avoid making assumptions about others’ cultural identities. While you may be able to identify some aspects of the cultural context within a communication encounter, there may also be cultural influences that you can’t see. A competent communicator shouldn’t assume to know all the cultural contexts a person brings to an encounter since not all cultural identities are visible. As with the other contexts, it requires skill to adapt to shifting contexts, and the best way to develop these skills is through practice and reflection.