Communication Processes, Theories and Models

Introduction

Marketing communication is the planned use of messages, media and interactions to create meaning and influence relationships between an organisation and its audiences. It includes advertising, public relations, sales promotion, personal selling, direct marketing, digital content, social media, packaging, sponsorship and customer service. These activities differ in format, but all depend on communication: a sender creates and encodes a message, a receiver interprets it, and some form of response may follow.

A communication campaign can fail even when its creative execution is attractive. The message may be unclear, the channel may be inappropriate, the source may lack credibility, cultural meanings may differ, or competing messages may create noise. Consequently, marketing professionals need more than creative skill. They must understand how communication works, how audiences process information and how communication objectives can be translated into measurable outcomes.

This chapter introduces the basic communication process and applies major communication and persuasion models: AIDA, the hierarchy-of-effects model, DAGMAR, source credibility, the elaboration likelihood model and related persuasion principles. These frameworks are not competing recipes that always produce the same answer. They are analytical tools. Their value lies in helping marketers diagnose audience responses, select communication strategies and evaluate campaign performance.

Learning objectives

By the end of this chapter, you should be able to:

• explain the sender–message–channel–receiver process;
• distinguish encoding, decoding, feedback and noise;
• apply AIDA, hierarchy-of-effects and DAGMAR to campaign planning;
• assess the effects of source credibility and message characteristics;
• distinguish central and peripheral processing using the elaboration likelihood model;
• connect communication objectives with suitable measures;
• identify ethical, cultural and technological limitations in persuasive communication.

1. The communication process

1.1 Core elements

A basic communication process contains the following elements:

The sender does not transmit meaning directly. The sender transmits signs from which the receiver constructs meaning. For example, a brand may encode reliability through a blue colour, a formal typeface and a guarantee statement. A receiver may decode these signs as trustworthy, old-fashioned or impersonal, depending on experience and culture. Communication is therefore a process of negotiated meaning rather than a simple movement of information.

A useful planning sequence is:

Sender → encoding → message → channel → decoding → receiver → response/feedback

Noise can affect every stage. It may be physical, such as poor audio; psychological, such as low attention; semantic, such as confusing terminology; or cultural, such as a symbol having different meanings in different communities.

1.2 One-way and two-way communication

Traditional mass communication is often represented as one-way communication: a brand sends a message to a large audience. This model remains useful for analysing broadcast advertising, outdoor media and packaging. However, digital platforms make communication more interactive. Customers can comment, share, review, remix or challenge brand messages. A customer-service conversation may involve several cycles of sending, receiving and feedback.

Feedback can be direct or indirect. A direct response is a question, complaint, click or purchase. Indirect feedback includes changes in search behaviour, store visits, brand sentiment or sales patterns. Feedback is valuable, but it must be interpreted carefully. A rise in clicks does not necessarily indicate understanding or purchase intention, and a lack of public comments does not prove that a campaign was ineffective.

1.3 Noise and communication barriers

Noise is not limited to technical interference. Important forms include:

• Physical noise: background sound, poor image quality or a broken link.
• Psychological noise: distraction, scepticism, stress or low involvement.
• Semantic noise: jargon, ambiguous wording or unfamiliar symbols.
• Information overload: too many competing messages and notifications.
• Cultural noise: assumptions that do not fit the audience’s values, language or norms.
• Channel noise: an unsuitable format, poor placement or an algorithmically reduced reach.

A professional communication plan attempts to reduce noise before launch. It uses audience research, plain language, pretesting, accessible design, suitable media placement and consistent brand cues. It also recognises that repetition can improve recall but excessive repetition can produce irritation or avoidance.

2. Communication objectives and audience movement

Marketing communication commonly seeks movement through several stages. A person may first become aware of a brand, then develop understanding, form an attitude, develop an intention and finally act. These stages are analytical rather than universal laws. Some purchases are habitual and require little conscious deliberation; others involve extensive information search and comparison.

A communication objective should state the intended audience, the current condition, the desired change and the time period. “Improve the brand image” is too vague for effective planning. A stronger objective might be: “Within three months, increase unaided awareness of the new service among first-year students in the city from the current baseline to a specified target.” The objective identifies an audience and a measurable change.

Communication objectives should not be confused with final business outcomes. Advertising may contribute to sales, but sales are also affected by price, distribution, product performance, competitors and economic conditions. A campaign can successfully increase awareness while sales remain unchanged because the product is unavailable. Conversely, sales may rise for reasons unrelated to communication. Sound evaluation therefore measures several stages of response.

3. AIDA: attention, interest, desire and action

The AIDA model proposes four sequential communication stages:

1. Attention: the audience notices the message.
2. Interest: the audience gives the message further attention.
3. Desire: the audience develops a favourable preference or motivation.
4. Action: the audience performs the intended behaviour.

AIDA is particularly useful for designing promotional messages and calls to action. A mobile advertisement may attract attention with a distinctive visual, create interest by explaining a problem, build desire through benefits and evidence, and encourage action through a trial offer or clear link.

The model helps identify weaknesses. If an audience does not notice a message, improving the call to action is unlikely to solve the problem. If attention is high but action is low, the problem may involve weak perceived value, insufficient trust, friction in the purchase process or an unsuitable offer.

AIDA has limitations. Real consumers do not always move through the stages in a fixed order. Brand familiarity can produce action with minimal attention, while a highly involved buyer may move repeatedly between interest, evaluation and action. AIDA is best treated as a planning heuristic, not a predictive law.

4. Hierarchy-of-effects models

The hierarchy-of-effects approach expands the idea that communication may influence audiences progressively. A frequently used sequence is:

Awareness → knowledge → liking → preference → conviction → purchase

The first two stages are cognitive: the audience knows that the brand exists and understands relevant information. Liking, preference and conviction are affective or attitudinal stages. Purchase is behavioural.

The model is useful because it separates recognition from understanding and understanding from preference. A campaign may achieve high awareness but poor knowledge if its message is memorable yet uninformative. It may produce knowledge without preference if competitors offer stronger benefits. It may produce preference without purchase if price, access or trust remains a barrier.

The sequence should not be interpreted mechanically. Consumers can experience the stages in different orders. Emotional attachment may precede detailed knowledge, and product trial may create preference rather than merely follow it. In low-involvement categories, repeated exposure and availability may be more influential than extensive conviction.

5. DAGMAR and measurable objectives

DAGMAR means Defining Advertising Goals for Measured Advertising Results, a framework associated with Russell Colley’s work on advertising objectives. It argues that advertising objectives should be stated as specific communication tasks rather than broad sales claims.

A well-formed DAGMAR objective identifies:

• a defined target audience;
• a measurable communication change;
• a baseline or starting condition;
• a specified time period; and
• the conditions under which the change will be measured.

The framework commonly describes movement through awareness, comprehension, conviction and action. For example, an objective might be: “Among existing customers aged 18–25 who have not used the mobile application, increase the proportion who understand the one-click returns feature from the baseline measured in April to the target measured in June.”

DAGMAR encourages accountability and research. It also exposes a common planning error: treating communication as solely responsible for sales. Communication objectives can measure awareness, comprehension, attitudes, intentions and responses, while business outcomes require broader analysis.

Its limitations include the difficulty of isolating communication effects and the assumption that awareness necessarily precedes action. Digital analytics can provide detailed behavioural data, but measurement remains affected by attribution problems, privacy restrictions, multiple exposures and unobserved influences.

6. Source credibility and message acceptance

The source of a message affects whether an audience accepts it. Source credibility generally contains two major dimensions:

• Expertise: the perceived knowledge or competence of the source.
• Trustworthiness: the perceived honesty, integrity and lack of deceptive intent of the source.

A doctor may be perceived as highly expert in health matters, while a satisfied customer may be perceived as credible because the person appears independent. A celebrity may attract attention and transfer symbolic meaning, but celebrity status alone does not guarantee expertise or trustworthiness.

Credibility is audience- and context-dependent. A professional athlete may be credible when discussing training equipment but not necessarily when discussing financial investment. Credibility can also change over time as audiences observe endorsements, sponsorship relationships and brand behaviour.

Source credibility interacts with message involvement. When involvement is low, a credible or attractive source may operate as a useful peripheral cue. When involvement is high, audiences may examine the evidence more carefully, and an attractive spokesperson cannot compensate for weak claims. Marketers should therefore match the source to the product, claim and audience, disclose commercial relationships and avoid presenting paid endorsement as independent opinion.

7. The elaboration likelihood model

The elaboration likelihood model (ELM), associated with Richard Petty and John Cacioppo, explains how people process persuasive messages. It identifies two broad routes:

7.1 Central route

Central processing occurs when the audience is motivated and able to think carefully about the message. The audience evaluates evidence, reasoning, relevance and the strength of claims. Attitudes formed through this route are more likely to be stable, resistant to counter-persuasion and predictive of behaviour.

Central processing is more likely when the issue is personally important, the audience has sufficient knowledge, the message is understandable and distractions are limited. A business buyer comparing software providers may examine security, cost, compatibility and performance evidence.

7.2 Peripheral route

Peripheral processing occurs when motivation or ability to elaborate is relatively low. The audience may rely on cues such as attractiveness, popularity, emotional tone, music, packaging, perceived authority or the number of arguments rather than carefully evaluating their quality.

Peripheral processing is not necessarily irrational. People have limited time and attention, and cues can provide useful shortcuts. However, attitudes formed mainly through peripheral cues may be less stable and more vulnerable when the cue changes or a competing message appears.

The ELM is not a rigid classification of people. The same person may use central processing for a costly purchase and peripheral processing for a routine product. A campaign may also combine routes: credible evidence can support central processing while design and emotion attract initial attention.

7.3 Applying ELM to campaign design

For high-involvement audiences, marketers should provide relevant evidence, comparisons, demonstrations, transparent qualifications and opportunities for questions. For low-involvement situations, clarity, distinctive cues, emotional relevance and repeated availability may be more effective. In both cases, misleading shortcuts are unethical. A large follower count, for example, does not prove product quality.

8. Other persuasion principles

Several principles help explain why messages influence attitudes and behaviour:

• Consistency: people tend to prefer alignment between their attitudes and actions.
• Social proof: perceived adoption by others can influence uncertainty.
• Reciprocity: a meaningful benefit may create a sense of obligation, although coercive use is unethical.
• Scarcity: limited availability can increase perceived value, but false scarcity is deceptive.
• Framing: presenting the same choice as a gain or loss can affect interpretation.
• Emotional association: feelings linked with a message may transfer to the brand.
• Repetition: repeated exposure can improve familiarity, but overexposure can produce wear-out.

These principles should be applied with attention to consumer autonomy. Persuasion becomes problematic when it conceals material information, exploits vulnerability, creates fabricated urgency or makes claims that cannot be substantiated.

9. Integrating models in professional planning

The models answer different questions and can be combined. A practical planning method is:

1. Diagnose the audience: identify needs, knowledge, involvement, barriers and media habits.
2. Define the communication objective: specify the desired change, audience, baseline and time frame.
3. Select the response stage: decide whether the immediate task is awareness, comprehension, attitude, intention or action.
4. Design the message: use AIDA to check attention, interest, desire and action; use ELM to determine the required level of evidence and involvement.
5. Select the source: assess expertise, trustworthiness, relevance and disclosure requirements.
6. Choose the channel: match channel strengths to audience access, message complexity and feedback needs.
7. Reduce noise: test wording, imagery, accessibility, cultural fit and technical delivery.
8. Measure outcomes: assess exposure, attention, comprehension, attitudes, intentions and behaviour rather than relying on one metric.

10. Applied case: GreenBite reusable lunch containers

This is an illustrative case. GreenBite, a small retailer of reusable lunch containers, wants to increase purchases among college students. The product is durable and leak-resistant, but students associate reusable containers with inconvenience and higher prices. The retailer has a limited budget and plans a campaign using short social videos, campus posters, student ambassadors and a website offer.

Background and problem

Initial interviews suggest that awareness of reusable containers is high, but knowledge of GreenBite’s leak-resistant design is low. Students like the environmental benefit but doubt whether the product is worth the price. The communication problem is therefore not simply recognition. It involves comprehension, perceived value, trust and action friction.

Analysis through the models

AIDA indicates that the campaign must first attract attention in a crowded student media environment. It should then create interest by demonstrating that the container fits a crowded bag and does not leak. Desire can be developed through convenience and cost-per-use benefits, while action can be encouraged by a simple student discount and an easily accessible purchase page.

The hierarchy-of-effects model suggests that the campaign should move students from awareness to knowledge and preference. A memorable environmental slogan alone would not provide sufficient product knowledge. Demonstration content is needed.

DAGMAR can guide an objective such as: “Over eight weeks, among students exposed to the campaign, increase correct understanding that the container is leak-resistant and dishwasher-safe, and increase visits to the product page from the established baseline.” The final targets would be set after baseline research.

Source credibility is important because environmental claims may be met with scepticism. A student ambassador who demonstrates actual use may be relevant and relatable, but claims should also be supported by clear product evidence. Paid relationships must be disclosed.

ELM suggests that many students will process short social videos peripherally, especially while scrolling. Strong visuals, a recognisable demonstration and social proof may encourage initial attention. Students considering the product carefully may use central processing and require information about materials, durability, cleaning and price.

Approach and solution

GreenBite creates two linked message formats. The first is a six-second demonstration showing a container turned upside down without leakage, followed by the brand name. The second is a longer product page explaining materials, cleaning instructions, durability and total cost of ownership. Posters use a concise headline and QR code, while ambassadors provide demonstrations at campus events.

The campaign reduces noise through plain language, captions, high-contrast design and a consistent product image. The website minimises action friction by displaying the student price, delivery information and returns policy before checkout.

Evaluation and outcome

The retailer measures aided and unaided awareness, recognition of the leak-resistant feature, product-page visits, QR scans, discount-code use, conversion rate and customer feedback. It compares results with the baseline and, where feasible, with a similar campus area that received less campaign activity. Such comparisons cannot prove causation perfectly, but they provide stronger evidence than counting views alone.

The illustrative outcome is that awareness rises substantially, but purchases increase only modestly. Interviews reveal that students understand the product but still consider the price high. The next communication phase emphasises durability and cost per use, while management also considers a smaller product size and student payment options. This demonstrates that communication cannot solve every marketing problem. Message effectiveness and the total value proposition must be considered together.

Learning points

The case illustrates five principles: awareness is not the same as comprehension; a message should match audience involvement; credible demonstrations can support both processing routes; measurement should cover stages of response; and communication problems may reflect product, price or distribution barriers.

11. Digital communication, data and artificial intelligence

Digital media increase opportunities for interaction, personalisation and rapid feedback. Marketers can test alternative headlines, identify audience responses and adapt content. However, digital indicators require interpretation. Impressions measure opportunities to see, not actual attention. Click-through rates measure clicks, not necessarily comprehension or satisfaction. Engagement may reward controversy rather than trust.

Artificial intelligence can assist with audience segmentation, copy variation, translation, sentiment analysis and predictive optimisation. Human oversight remains necessary because automated systems can reproduce bias, misunderstand cultural context, generate inaccurate claims or personalise messages in ways that feel intrusive. Organisations should establish approval procedures for factual claims, privacy protection, disclosure of synthetic or altered content where relevant, accessibility and records of significant automated decisions.

Personalisation also creates an ethical tension. Relevant communication can reduce information overload, but extensive tracking may undermine autonomy and privacy. Consent should be meaningful, data collection proportionate and targeting especially cautious when audiences include children or vulnerable people.

12. Limitations and best practices

Communication models simplify complex behaviour. They may imply linear progression, assume that attitudes cause behaviour, or understate structural conditions such as income, availability and regulation. They can also encourage managers to measure what is easy rather than what matters. A balanced approach treats models as diagnostic frameworks and combines them with research.

Best practices include:

• define a specific audience and communication problem;
• distinguish communication objectives from sales objectives;
• use baseline measures before making performance claims;
• match source expertise and trustworthiness to the claim;
• provide evidence for high-involvement decisions;
• design clear calls to action and accessible content;
• pretest language, imagery and cultural interpretation;
• disclose sponsorships, incentives and material relationships;
• avoid fabricated scarcity, hidden fees and unsupported environmental claims;
• measure both short-term responses and longer-term brand effects;
• protect personal data and maintain human accountability for automated tools.

Chapter Summary

Marketing communication is a process in which senders encode messages for receivers through selected channels. Meaning is interpreted rather than simply transferred, and feedback helps organisations understand audience responses. Noise may be physical, psychological, semantic, cultural or technological, so effective planning requires research, testing and clarity.

AIDA frames communication as attention, interest, desire and action. The hierarchy-of-effects model distinguishes awareness, knowledge, attitudes, conviction and purchase. DAGMAR encourages specific, measurable communication objectives that identify an audience, a desired change, a baseline and a time period. Source credibility depends especially on expertise and trustworthiness. The elaboration likelihood model distinguishes central processing, based on careful evaluation, from peripheral processing, based on cues and shortcuts. These models can be integrated to diagnose communication problems, design messages and select measures.

Professional practice must recognise that communication is only one influence on behaviour. Product value, price, access, social context and consumer resources also matter. Ethical communication respects autonomy, supports truthful and accessible information, discloses commercial relationships and uses data and AI responsibly.

Key Terms

Sender: The originator of a communication.

Encoding: Converting intended meaning into signs, words, images or symbols.

Message: The content presented to an audience.

Channel: The medium or route used to deliver a message.

Receiver: The person or group that encounters and interprets a message.

Decoding: The process of assigning meaning to a message.

Feedback: A response that informs the sender about audience reaction.

Noise: Any interference that affects transmission or interpretation.

AIDA: A model comprising attention, interest, desire and action.

Hierarchy of effects: A framework describing movement from awareness and knowledge through attitudes to behaviour.

DAGMAR: Defining Advertising Goals for Measured Advertising Results.

Communication objective: A specified desired change in audience response.

Source credibility: The perceived expertise and trustworthiness of a communicator.

Expertise: Perceived knowledge or competence of a source.

Trustworthiness: Perceived honesty and integrity of a source.

Elaboration likelihood model: A persuasion model distinguishing central and peripheral processing.

Central route: Careful evaluation of message arguments.

Peripheral route: Reliance on contextual or symbolic cues when elaboration is limited.

Information overload: A condition in which competing information exceeds available attention or processing capacity.

Persuasion: Communication intended to influence attitudes, intentions or behaviour.

Review Questions

Short Answer Questions

1. Define encoding and decoding, and explain why they may produce different meanings.
2. Identify four types of noise that can affect marketing communication.
3. What are the four stages of the AIDA model?
4. What two dimensions are central to source credibility?
5. Distinguish central-route processing from peripheral-route processing.

Long Answer Questions

1. Explain the sender–message–channel–receiver process and discuss the role of feedback and context.
2. Compare AIDA with the hierarchy-of-effects model. Identify one strength and one limitation of each.
3. Explain how DAGMAR can improve the quality of marketing communication objectives.
4. Discuss how source credibility affects persuasion in high- and low-involvement situations.
5. Explain how a marketer could integrate AIDA, DAGMAR and the elaboration likelihood model in one campaign.

Analytical / Application Questions

1. A campaign receives many views but few product-page visits and almost no purchases. Use at least two communication models to diagnose possible problems and recommend measures.
2. A brand uses a popular influencer to promote a technical financial product. Analyse the campaign using source credibility and the elaboration likelihood model. What ethical safeguards should be added?
3. Design a communication objective and message strategy for a new service aimed at students. State the audience, desired response, likely noise, channel, source and evaluation measures.

Multiple Choice Questions with Answers

Question 1

Which element converts an intended meaning into words, images or symbols?

A. Encoding

B. Feedback

C. Decoding

D. Noise

Correct Answer: A. Encoding

Question 2

Which example is semantic noise?

A. A broken microphone

B. A customer misunderstanding technical jargon

C. A distracting background conversation

D. A slow internet connection

Correct Answer: B. A customer misunderstanding technical jargon

Question 3

In AIDA, which stage follows interest?

A. Awareness

B. Knowledge

C. Desire

D. Conviction

Correct Answer: C. Desire

Question 4

What is the principal purpose of a DAGMAR objective?

A. To guarantee a specific sales volume

B. To specify a measurable communication change

C. To select the most attractive spokesperson

D. To eliminate all competing advertising

Correct Answer: B. To specify a measurable communication change

Question 5

Which pair represents the two major dimensions of source credibility?

A. Popularity and frequency

B. Expertise and trustworthiness

C. Emotion and humour

D. Reach and repetition

Correct Answer: B. Expertise and trustworthiness

Question 6

A buyer carefully compares software security evidence, costs and compatibility. Which ELM route is most likely?

A. Central route

B. Peripheral route

C. Automatic route

D. Social route

Correct Answer: A. Central route

Question 7

A campaign has high awareness but low understanding of the product benefit. Which response stage requires the greatest attention?

A. Action

B. Comprehension or knowledge

C. Purchase frequency

D. Distribution

Correct Answer: B. Comprehension or knowledge

Question 8

Which statement about feedback is most accurate?

A. It occurs only when a customer makes a purchase.

B. It can include clicks, complaints, comments and behavioural patterns.

C. It is identical to noise.

D. It proves that a message was understood correctly.

Correct Answer: B. It can include clicks, complaints, comments and behavioural patterns.

Question 9

Why should paid influencer relationships generally be disclosed?

A. Disclosure increases physical distribution.

B. Disclosure helps audiences understand the commercial context of the message.

C. Disclosure guarantees central-route processing.

D. Disclosure removes the need for evidence.

Correct Answer: B. Disclosure helps audiences understand the commercial context of the message.

Question 10

Which measure would best assess whether an audience understood a product claim?

A. Number of impressions alone

B. Correct recall or recognition of the claim

C. The colour of the advertisement

D. The number of employees in the company

Correct Answer: B. Correct recall or recognition of the claim