Next up at bat in our series on applying persuasion principles to email marketing and design is the powerful duo, commitment and consistency, which happens to be the second principle within Dr. Cialdini’s 6 Principles of Persuasion. When executed successfully, this combination will help you move one step closer to achieving a persuasive email marketing campaign—something that can only be accomplished by implementing these principles.

If you haven’t read the previous article within this series and want more context on the six persuasion principles, we recommend beginning at article one.

Understanding Cialdini’s Second Principle of Persuasion: Commitment and Consistency

Commitment and consistency are a powerful social psychological tool. The principle is defined as the following:

Once we make a decision or take a stand, we are likely to make future decisions to match that past behavior.

Follow along as we cover, in detail, what this principle means for you and your email campaigns.

What is the commitment and consistency principle?

Nobody wants to admit that they’re wrong, that they’ve misspent their money, or that they’ve made a mistake. This is why the principle of commitment and consistency is so effective. Once a user decides or takes an action, they’re much more likely and much more driven to have their future actions remain consistent with their initial decision.

This principle works well because users have an innate obsessive desire to be, and to appear to be, consistent with their prior commitments. It has to do with personal, interpersonal, and psychological influences rooted deep within psychology.

The Proof

There’s great proof and research that supports the principle of commitment and consistency. Here, we’ll cover just a few of the many examples including the racetrack study and the New York City beach crime study.

The Racetrack Study

The racetrack study was an academic study performed by a pair of Canadian psychologists. The study took place at the racetrack where the psychologists observed several individuals placing bets on horses. What they found was surprising.

They observed the following: individuals would randomly select a horse to place a bet on. At the time of placing their bet, the observed individuals knew nothing about their selected horse. Yet, just after the bet was placed, they noted that the individuals felt much more confident in their selected horse’s chances of winning than they were immediately before the bet was placed. This is surprising because all other variables remained constant—it was the same horse, the same horse owner, the same track, and the same field. The only thing that changed was the individual’s perspective, as they now believed their chances of winning increased drastically.

Why did the individuals feel significantly more confident after the bet was placed? The Canadian psychologists concluded that this is because we, as humans, are designed to remain consistent with our prior commitments.

New York City Beach Crime Study

Psychologist Thomas Moriarty conducted the New York City beach crime study. Moriarty conducted the study to prove that individuals are psychologically driven to remain consistent with their previous actions. But beyond that he also wanted to prove that, within certain scenarios, this psychological influence drives individuals to act in ways that are clearly contrary to their own best interest.

To prove these claims, Moriarty ran a study in which he staged thefts on a beach in New York City. He wanted to see if bystanders would risk being harmed to stop the crime. Within these scenarios, one accomplice would set their blanket down on the beach next to an individual, which is the experimental subject. The accomplice would then take a stroll, leaving the blanket, a radio, and a few other belongings. During this time, another accomplice would pose as the thief. They would run past the now vacant blanket and take off with the radio. In these scenarios, the experimental subjects, or the bystanders, were reluctant to stop the thief. In fact, only four out of 20 observed individuals tried to stop the crime from taking place.

Then Thomas Moriarty ran the experiment again. Except this time, he put a spin on the mocked-up crime scene. He had the first accomplice, the one who lounged on the blanket, ask the bystander if they would watch their things before, they went on a stroll. The bystander would agree. After this request was accepted by the experimental subject, the results of the study changed drastically.

After the accomplice asked the bystander to watch their things, the other accomplice would come by and stage the theft. Yet this time, 19 out of 20 individuals tried to stop the crime from taking place. The bystanders put themselves in danger because they were propelled by the psychological influence of consistency. Because they previously agreed to watch the accomplice’s things, they were driven to act in a consistent manner later down the road—proving that commitment and consistency is powerful enough to cause individuals to act in ways that are typically out of the norm for them.

The Support

Now that we’ve discussed what commitment and consistency is and how it’s been proven true over the years, let’s move onto the support. Here, we’ll cover how to apply and identify this principle within email campaigns.


The first email we’d like to use as an example was sent out by a company called Marketo. If you’ve ever touched a marketing automation project, you’re familiar with this company.

The example below is of an email that’s sent after a user hasn’t engaged with Marketo emails in over a year. It’s designed to elicit a response from the user. At its core, the email is a basic list cleaning email. However, after taking the time to look at it strategically, it’s much more than this. This is because Marketo used the principle of commitment and consistency to leverage their email campaign.

Marketo email example graphic

When a user receives this email, they’re hit over the head with a powerful headline that reads, “Moving on is hard.” Additionally, later down the email, the user is asked to interact with one of two buttons. They’re prompted to select either a button that reads, “YES, keep the emails coming” or a button that reads, “NO, I would like to unsubscribe.”

Marketo is hoping the user selects the button, “YES, keep the emails coming.” They’re hoping for this outcome because they know that when this button is selected, the user experiences something that we like to call a psychological tug. A psychological tug is that voice in your head, weeks down the road, telling you something along the lines of “Hey, you remember this company Marketo. You should pay attention to this.”

Users experience this tug only when they’ve previously declared, said, and clicked “YES.” This is true because we know that when the user previously commits, they’re more likely to behave in a similar fashion the next time around. This claim is the beauty and the power behind the principle of commitment and consistency and is why this email is so effective.


The next example we have for commitment and consistency is from REI, a company that sells products for a wide range of outdoor and fitness activities. In the previous example, the company was trying to cling on to a long-term relationship that was dwindling. However, in this example, REI is welcoming a user for signing up. They’re striving to begin a new, fresh, and hopefully long-lasting relationship.

This email is sent to the user immediately after they’ve signed up for the company’s newsletter. The user opens the email and is expecting the copy to be friendly, kind, and welcoming just like any other welcome email they’ve come to know. However, while REI invokes these emotions subtly, this email is much more direct with the user. This is apparent through the main headline that reads, “Take the next step.”

While REI may have written this headline intuitively, this phrasing is so effective because it plays upon the user’s previous action. When the company mentions, “Take the next step” they’re insinuating that a first step has already been taken, while at the same time playing with the outdoors/hiking theme with regards to being active and moving, i.e., taking steps. By reminding the user of this connection, a psychological tug becomes present. In this case, the psychological tug entices the user, saying something along the lines of, “You’ve already taken a step in. Come on, let’s move a bit further down this path.”

REI email example graphic

Welcome emails, like this REI example, are sent all the time by a wide range of companies. In fact, they’re so popular that you have a handful of similar emails sitting in your inbox right now. However, have you ever stopped to think why so many companies take part in these campaigns? Are they even effective?

It’s our job as marketers to uncover the truth behind these questions. We can do so by diving deep into email campaigns and thinking about important question such as, “What’s going on at a social psychological level?” and “What is it that makes these types of emails work?”

When you get in the mindset of the user and answer these types of questions, you’re able to understand the psychological foundation that’s supporting your email campaign. This will help change your perspective from, “Everyone else is doing it. It must be working. I’ll do it too.” to “I’ve thought strategically about this. I’ve made a few tweaks here and there. I feel confident sending this email because I know users will connect with it.”

This change in perspective will help you transform what could be a rudimentary welcome email into an incredibly persuasive email campaign.


Our next example of the commitment and consistency principle is from Salesforce. In a strategic email campaign, Salesforce underscores its dedication to helping users establish and maintain meaningful connections with their customers. This initiative takes the form of a well-crafted email, brimming with an array of valuable resources, including insightful reports and enriching e-books. These resources are thoughtfully offered to recipients for download following their participation in a Salesforce field marketing event.

Salesforce keenly recognizes the pivotal moment when a user engages with their event. They understand that this initial commitment is a strong indicator of future engagement and consistency. By offering these post-event resources, Salesforce not only empowers users with valuable knowledge but also encourages them to continue their journey with Salesforce’s suite of services. This approach is founded on the principle that individuals who make an initial commitment are more likely to maintain their engagement over time, leading to mutually beneficial, long-lasting relationships between Salesforce and its user bas

The Application

When applying commitment and consistency to email design, think about what type of commitment you can get your users to take. Be sure to think, test, measure, and then implement relevant ways to engage your users quickly and efficiently. Remember, once your users commit, consistency will follow so be sure to remain persistent and create dialogue with the user shortly after their first commitment.

In the next article, you’ll learn about the power behind the third principle of persuasion, social proof