Influence Psychology Framework

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:

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:

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:

1. Get micro-commitment ("What brings you here?")
2. Small action (click, choice, input)
3. Public or written commitment (goal, preference)
4. 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:

Product applications:

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.

Key insights:

• Titles, credentials, uniforms trigger automatic compliance
• Authority is conferred (doctors, professors) and assumed (confident tone)
• Admitting a weakness paradoxically increases authority (trustworthiness)
• Expertise in one domain doesn't transfer, but people assume it does
• Even symbols of authority work (lab coats, official-looking designs)

Sources of authority:

Product applications: