Framework for applying the science of persuasion ethically and effectively. Based on six decades of research into why people say "yes" and what makes them comply with requests.
Core Principle
People don't make decisions rationally. They use mental shortcuts (heuristics) that can be triggered to influence behavior. These shortcuts evolved because they're usually reliable—but they can also be exploited.
The foundation:
Understanding the psychological triggers that drive human compliance allows you to design products, messaging, and experiences that naturally align with how people actually make decisions.
Scoring
Goal: 10/10.
When reviewing or creating persuasive elements (features, copy, flows, campaigns), rate them 0-10 based on adherence to the principles below. A 10/10 means ethical, effective application of influence psychology; lower scores indicate missed opportunities or ethical concerns. Always provide the current score and specific improvements needed to reach 10/10.
The Seven Principles of Influence
1. Reciprocity
Core concept:
People feel obligated to give back to others who have given to them first.
Why it works:
Humans are wired to avoid being indebted. The obligation to repay is so strong that it can overpower other factors like personal preference or fairness.
Key insights:
The gift must come first (before the request)
Personalization increases power
Unexpected gifts are more powerful than expected ones
Even small gifts create obligation
The return favor often exceeds the original gift
Product applications:
Context
Reciprocity Trigger
Example
Free trials
Give full access first, then ask to pay
Spotify Premium trial → subscription
Content marketing
Provide value upfront (guides, tools)
HubSpot free CRM → paid tools
Referral programs
Give reward to both referrer and referee
Dropbox: both get extra storage
Onboarding
Unlock a premium feature temporarily
Grammarly: free tone detection trial
SaaS
Provide unexpected value or support
Personalized setup call for new users
Copy patterns:
"Here's a gift for you..." (before asking)
"We've upgraded your account..."
"As a thank you for signing up..."
"We noticed you needed help with X, so we..."
Ethical boundary:
Give genuine value. Don't create artificial debts or exploit obligation.
See:
references/reciprocity.md
for reciprocity techniques and case studies.
2. Commitment & Consistency
Core concept:
People want to be consistent with their past statements, beliefs, and actions.
Why it works:
Inconsistency is psychologically uncomfortable. Once we've made a choice or taken a stand, we encounter personal and interpersonal pressure to behave consistently with that commitment.
Key insights:
Small initial commitments lead to larger ones (foot-in-the-door)
Public commitments are stronger than private ones
Written commitments are stronger than verbal ones
Active commitments (user-generated) are stronger than passive ones
Self-perception: we infer our attitudes from our behavior
Product applications:
Context
Commitment Trigger
Example
Onboarding
Start with easy yes, build to larger asks
Duolingo: "Can you commit to 5 min/day?"
Progressive profiling
Small data requests that compound
LinkedIn: add photo → headline → experience
Goal setting
User publicly states a goal
Strava: "I want to run 50km this month"
Social proof generation
Ask for review after positive action
Airbnb: review request after good stay
Habit formation
Track streak publicly
Snapchat streaks, GitHub contributions
Copy patterns:
"What's your biggest challenge with X?" (commitment to a problem)
"How much would you like to save per month?" (numerical commitment)
"Would you like to join X people who've already...?"
"You said you wanted to achieve X. Let's start with..."
Onboarding sequence:
Get micro-commitment ("What brings you here?")
Small action (click, choice, input)
Public or written commitment (goal, preference)
Reinforce consistency ("Based on what you told us...")
Ethical boundary:
Don't lock users into commitments they didn't freely make. Allow easy reversibility.
See:
references/commitment-consistency.md
for commitment tactics and flows.
3. Social Proof
Core concept:
People determine what's correct by finding out what other people think is correct.
Why it works:
When uncertain, we look to others' behavior as a guide. "If everyone's doing it, it must be right."
Key insights:
Most powerful when observers are uncertain
Similar others = stronger proof (age, location, goals)
Negative social proof can backfire ("9 out of 10 don't...")
Specific numbers > vague claims ("2,347 users" > "thousands")
Live activity = urgency + proof
Types of social proof:
Type
Definition
Example
Wisdom of crowds
Many people use/buy
"Join 50,000+ marketers"
Wisdom of friends
People you know use it
"3 of your friends use Notion"
Expert
Authorities endorse
"Recommended by Y Combinator"
Celebrity
Famous people use it
"Used by Elon Musk"
Certification
Third-party validation
"SOC 2 compliant", "App of the Year"
User
Similar people succeeded
"Startups like yours grew 10x"
Product applications:
Context
Social Proof Implementation
Example
Landing pages
User count, reviews, logos
"Trusted by 10,000+ companies"
Signup flow
Live signups, popular plans
"23 people signed up in the last hour"
Feature adoption
Show usage by others
"85% of teams use this feature"
Urgency
Limited availability
"Only 3 spots left at this price"
Reviews
Ratings, testimonials, case studies
G2 badges, video testimonials
Copy patterns:
"[X number] of [similar people] are already..."
"[Name/Company] increased [metric] by [%]"
"Don't take our word for it. Here's what [users] say..."
"Join [X] others in [cohort]"
Ethical boundary:
Never fabricate social proof. Real numbers, real testimonials. Disclose when proof is curated.
See:
references/social-proof.md
for social proof types and implementation patterns.
4. Authority
Core concept:
People follow the lead of credible, knowledgeable experts.
Why it works:
Obedience to authority is deeply ingrained. Following experts is an efficient shortcut when we lack expertise ourselves.
Don't create toxic in-groups or vilify out-groups. Unity should unite, not divide maliciously.
See:
references/unity.md
for unity-building strategies.
Combining Principles
The most powerful persuasion uses multiple principles together.
Example: SaaS landing page
Authority:
"Built by ex-Stripe engineers" (credentials)
Social proof:
"Trusted by 5,000+ companies" (wisdom of crowds)
Liking:
Friendly, warm copy and design
Scarcity:
"Join the beta—limited spots available"
Reciprocity:
"Start free, no credit card required"
Unity:
"For founders who move fast"
Example: Referral program
Reciprocity:
Give reward to both parties
Social proof:
"X friends already joined"
Unity:
"Invite your team"
Commitment:
After they've had a good experience
Ethical Application Checklist
Before deploying influence tactics:
Is it truthful?
No fake scarcity, fabricated proof, or false credentials
Does it help the user?
Persuasion should align with user goals, not exploit them
Is it transparent?
Are you hiding how you're influencing them?
Is it reversible?
Can users easily undo commitments?
Would you use it on yourself/family?
The golden rule of persuasion
Does it respect autonomy?
Users should feel in control, not manipulated
Are you targeting vulnerable groups?
Extra caution with children, elderly, desperate
The line between persuasion and manipulation:
Persuasion:
Helping people see value they'd appreciate anyway
Manipulation:
Tricking people into choices against their interests
See:
references/ethics.md
for comprehensive ethical boundaries.
Common Mistakes
Mistake
Why It Fails
Fix
Fake social proof
Destroys trust when discovered
Use real data or don't use it
Overuse of scarcity
Becomes noise, loses power
Reserve for genuine urgency
Inconsistent authority
Undermines credibility
Don't claim expertise you lack
Forced reciprocity
Feels transactional, not genuine
Give without immediate ask
Generic unity
"Everyone" is not a tribe
Define specific shared identity
Quick Diagnostic
Audit any persuasive element:
Question
If No
Action
Which principle(s) am I using?
You're relying on luck
Explicitly design for influence
Is this claim/tactic truthful?
You're manipulating
Remove or replace with truth
Would this work on me?
It probably won't work on others
Redesign with genuine value
Am I combining principles?
Missing leverage
Layer multiple principles
Can users easily reverse?
Ethical concern
Add clear opt-outs
Reference Files
reciprocity.md
Reciprocity techniques, gift strategies, examples
commitment-consistency.md
Commitment flows, foot-in-the-door, public commitment tactics
social-proof.md
Social proof types, implementation patterns, case studies
authority.md
Building authority, credentials, thought leadership
liking.md
Liking factors, brand voice, rapport-building
scarcity.md
Scarcity tactics, ethical vs. manipulative scarcity
unity.md
Tribe-building, identity marketing, community
ethics.md
Ethical boundaries, manipulation vs. persuasion
case-studies.md
Real-world applications across industries
copywriting.md
Influence-based copy frameworks
Further Reading
This skill is based on Robert Cialdini's research and books. For the complete science, research citations, and expanded case studies:
"Influence: The Psychology of Persuasion"
by Robert B. Cialdini (Original + Expanded Edition with Unity principle)
"Pre-Suasion: A Revolutionary Way to Influence and Persuade"
by Robert B. Cialdini (Advanced: creating privileged moments for influence)
About the Author
Robert B. Cialdini, PhD
is Regents' Professor Emeritus of Psychology and Marketing at Arizona State University. His research on the psychology of influence has been published extensively and is widely cited.
Influence
has sold over 5 million copies worldwide and is considered the foundational text on persuasion science. Cialdini has consulted for Fortune 500 companies, government agencies, and nonprofits on ethical influence strategies.