---
name: cro-methodology
description: Audit websites and landing pages for conversion issues and design evidence-based A/B tests using a scientific, customer-centric methodology.
license: MIT
---

# CRO Methodology

Scientific, customer-centric approach to conversion rate optimization based on the CRE Methodology(TM). Extraordinary improvements come from understanding WHY visitors don't convert, not from copying competitors or applying generic tips.

## Core Principle

**Don't guess -- discover.** Every visitor who doesn't convert has a reason. Discover those reasons through research, then systematically eliminate them with evidence and proof. This evidence-based approach consistently outperforms "best practices", intuition, competitor copying, and expert opinion.

## Scoring

**Goal: 10/10.** Score any landing page, funnel, or conversion flow against the seven Quick Diagnostic rows below: award ~1.4 points per row answered "yes" (7 rows = 9.8, capped at 10). Bands: **9-10** = single clear action, research-grounded O/CO table, value prop legible in 5 seconds, proof at every friction point, funnel mapped, path free of UX blockers; **5-6** = guessed objections, generic best-practices copy, proof buried in FAQs; **<=3** = competing CTAs, no funnel map, claims with no proof. Report the current score and the specific diagnostic rows failing.

## The CRO Frameworks

### 1. The CRO Process

**Core concept:** A systematic 9-step process moving from defining success metrics through research and experimentation to scaling wins across the business.

**Why it works:** Random optimization skips research. The process forces you to understand visitors before changing anything, so every change rests on evidence, not opinion.

**Key insights:**
- Define success metrics aligned with business KPIs before touching any page
- Map the entire funnel to find "blocked arteries" (high-traffic underperforming paths) and "missing links" (absent funnel stages)
- Research visitors in three dimensions: who they are, what blocks them (UX problems), what stops them (objections)
- Gather market intelligence from competitors, reviews, and other industries
- Prioritize ideas with ICE scoring; design bold experiments, not "meek tweaks"
- Run experiments with statistical rigor (95% confidence minimum, full business cycles), then scale wins across the business

**Product applications:**

| Context | CRO Process Step | Example |
|---------|-----------------|---------|
| **Landing page audit** | Define goals, map funnel, research visitors | 70% bounce because value prop is unclear |
| **Checkout optimization** | Map funnel for blocked arteries | Shipping cost shock causes 40% cart abandonment |
| **Email sequence** | Scale wins | Winning objection-handling copy reused in drip emails |

**Copy patterns:**
- "What's preventing you from [action] today?" (exit survey to discover objections)
- "Here's what [X] customers found..." (counter-objection with social proof)

See [funnel-analysis.md](references/funnel-analysis.md) when mapping the funnel -- step-by-step mapping, blocked-artery/missing-link diagnosis, industry funnel benchmarks, and impact-based prioritization.

### 2. Customer Research & Objections

**Core concept:** Visitors fail to convert for specific, discoverable reasons. Exit surveys, chat logs, support tickets, sales calls, and reviews reveal the "voice of the customer" and their real objections.

**Why it works:** Teams' guesses about why visitors leave are almost always wrong. Research uncovers objections no one anticipated, and the customer's own language out-persuades any copywriter's invention.

**Key insights:**
- Primary sources (exit surveys, live chat, tickets, sales calls) give direct visitor language; secondary sources (reviews, social media, competitors) reveal industry-wide objections
- The "Big 5" universal objections: Trust, Price, Fit, Timing, Effort
- Quantitative research (analytics, heatmaps) shows WHERE problems are; qualitative (surveys, interviews) shows WHY
- Non-converter surveys should ask ONE question for maximum response; post-purchase surveys ("What almost stopped you from buying?") reveal the objections that matter most

**Product applications:**

| Context | Research Method | Example |
|---------|---------------|---------|
| **Exit intent** | On-site survey | "What's preventing you from signing up today?" |
| **Post-purchase** | Email survey within 7 days | "What almost stopped you from buying?" |
| **Objection mining** | Support tickets + reviews | Search "but", "however", "worried about"; negative reviews = unaddressed objections |

**Copy patterns:**
- Use exact customer language in headlines and body copy -- it outperforms polished marketing copy
- "What's the one thing we could change to make you [action]?"
- "How would you describe [product] to a friend?" (reveals positioning in customer terms)

**Ethical boundary:** Anonymize data, get consent for recordings, and don't survey so aggressively that you degrade the experience.

See [RESEARCH.md](references/RESEARCH.md) when planning research -- ready-to-use survey questions per channel, recommended tools, and how to turn raw responses into a ranked objection list.

### 3. Persuasion Assets

**Core concept:** Every company sits on overlooked proof -- undisplayed testimonials, unmentioned awards, hidden credentials, buried guarantees. Inventory these "persuasion assets", acquire missing ones, display them.

**Why it works:** Visitors decide on evidence, not claims. A modest claim with overwhelming proof beats a bold claim with none.

**Key insights:**
- Audit five categories: Credentials & Authority, Social Proof, Risk Reversal, Data & Specificity, Process & Methodology
- Create a wish list for missing assets and actively acquire them (request testimonials, apply for awards, compile statistics)
- "Proof sandwich" structure: Claim (bold promise), then Proof (evidence), then Reinforcement (secondary proof)
- Proof hierarchy, strongest first: specific results with context > named testimonials with photos > case studies > statistics > logos > generic testimonials
- Place proof at points of friction, not in FAQs; specific numbers beat round ones ("47,832 customers" beats "About 50,000")

**Product applications:**

| Context | Persuasion Asset | Example |
|---------|-----------------|---------|
| **Landing page header** | Logo bar + rating | "Trusted by 10,000+ companies" with 5 recognizable logos |
| **Pricing page** | Risk reversal | "30-day money-back guarantee, no questions asked" |
| **Checkout flow** | Trust badges near forms | Security certification, payment logos, guarantee seal |

**Copy patterns:**
- "Here's how we did it for [Company X]..." (case study proof)
- "[Specific number] businesses trust us" (not "thousands of customers")
- Lead with benefits, not features: "Never delete another photo" beats "256GB storage"

**Ethical boundary:** Never fabricate testimonials, inflate statistics, or display fake trust badges -- all proof must be genuine and verifiable.

See [PERSUASION.md](references/PERSUASION.md) when auditing or acquiring proof -- the full five-category asset checklist and psychological triggers. See [COPYWRITING.md](references/COPYWRITING.md) when writing the proof copy itself -- headline formulas, benefit-led phrasing, and proof-element wording.

### 4. The O/CO Framework

**Core concept:** The Objection/Counter-Objection table is the core CRE technique: map every visitor objection to a specific, evidence-backed counter-objection.

**Why it works:** The table forces every counter to be placed where its objection arises in the reading flow, so a concern is answered the instant the visitor feels it -- not pages later, by which point they have already left.

**Key insights:**
- Research objections from surveys, chat logs, tickets, and sales calls -- don't guess
- Implicit objections (ones visitors won't admit) require "CO Only": counter without stating the objection
- Place counter-objections at the point of friction (credit-card objection near the payment form), not buried in FAQ
- Address primary objections above the fold; repeat the same counter in multiple formats (text, video, testimonial, data)
- Canned support responses are goldmines of tested counter-objections

**Product applications:**

| Objection | Visitor Question | Counter-Objections |
|-----------|------------------|--------------------|
| **Trust** | "Why should I believe you?" | Named testimonials, media logos, awards, guarantee |
| **Price** | "Is it worth the money?" | ROI calculator, cost comparison vs. alternatives, payment plans |
| **Fit** | "Will it work for MY situation?" | Similar-customer case studies, segmented pages, free trial |
| **Timing** | "Why act now?" | Cost-of-delay math, genuine limited offers, seasonal relevance |
| **Effort** | "How hard will this be?" | "Done for you" framing, "Set up in 5 minutes", step-by-step breakdown |

**Copy patterns:**
- Bad (states implicit objection): "Worried you're too lazy to learn a language?"
- Good (CO Only): "Let the audio do the work for you."
- "What almost stopped you from buying?" (post-purchase survey to validate the O/CO table)

**Ethical boundary:** A counter-objection must resolve the concern with real evidence, not dismiss a legitimate worry as unfounded.

See [OBJECTIONS.md](references/OBJECTIONS.md) when building the O/CO table -- per-category counter-objection technique catalogs, CO-Only patterns for implicit objections, and how to mine objections from support logs.

### 5. Hypothesis Design

**Core concept:** Every experiment needs a documented hypothesis linking a specific change to an expected outcome for a research-grounded reason, prioritized with ICE scoring (Impact, Confidence, Ease).

**Why it works:** A hypothesis forces you to articulate WHY a change should work, grounding it in customer research. ICE scoring stops teams wasting traffic on low-impact tweaks.

**Key insights:**
- Format: "If we [change X], then [metric Y] will improve because [reason based on research]"
- Define primary (decides winner), secondary (monitoring), and guardrail (must not decrease) metrics before testing
- ICE, 1-10 each: Impact (could this double conversion?), Confidence (how strong is the research?), Ease (how easy to implement?); prioritize by the average
- The 10x screen: if a change couldn't 10x results, deprioritize it. Worth testing: complete redesign, new value proposition, fundamentally different offer. Not worth testing: button color, font size, image swap

**Worked example:** "Customer language from surveys will lift signups because visitors see their own words" scores I:8, C:9, E:10 = 9.0 -- a top-priority test. A button-color swap scores ~I:2, C:2, E:10 = 4.7 and gets skipped despite being trivial to build.

**Copy patterns:**
- "Based on our research, visitors' #1 objection is [X]. This test addresses it by [Y]."
- Document before: hypothesis, primary metric, sample size, duration. Document after: raw numbers, confidence interval, learnings, next steps

See [testing-methodology.md](references/testing-methodology.md) when prioritizing or scoring a backlog -- per-axis ICE scoring rubrics, a worked prioritization table, and the weighted-ICE variant.

### 6. A/B Testing Methodology

**Core concept:** Run controlled experiments comparing page versions with proper statistical rigor, so results reflect reality rather than random noise.

**Why it works:** Without rigor you can't distinguish real improvements from random variation -- peeking, undersized samples, and ignored practical significance all manufacture false winners.

**Key insights:**
- Calculate required sample size BEFORE starting (baseline rate, minimum detectable effect, 80% power, 95% significance)
- Run at least one full business cycle (1-2 weeks), covering weekdays AND weekends
- Never peek at results and stop early -- it dramatically inflates false positives
- Practical significance matters: a statistically significant 0.1% lift isn't worth implementation complexity
- Use multivariate only with 100k+ monthly visitors on a proven winning page
- Promote winners to the new control; a failed test that teaches you something beats a win you don't understand

**Product applications:**

| Context | Test Type | Example |
|---------|----------|---------|
| **Concept validation** | A/B test (2-4 variants) | Two fundamentally different layouts based on different customer insights |
| **Low traffic** | Bold A/B test | Dramatic changes reach significance on far smaller samples than timid ones |
| **Post-test** | Scale wins | Apply winning insights to landing pages, ad copy, email sequences |

**Copy patterns:**
- "We increased [metric] by [X]% with [Y]% confidence over [Z] weeks"
- "Test showed no significant difference, teaching us that [insight about customers]"
- Document learnings: Test, Hypothesis, Result, Learning, Applicable to

**Reporting rule:** Decide sample size and duration up front, then report whatever the pre-set test returns -- never stop early on a peeked "winner," rerun a test until it yields the answer you want, or bury an inconclusive result. (This is the one honest-reporting constraint for the whole methodology.)

## Common Mistakes

| Mistake | Why It Fails | Fix |
|---------|-------------|------|
| **Copying competitors blindly** | You don't know if it even works for them | Research YOUR visitors' objections, build YOUR evidence |
| **Testing button colors before understanding objections** | Surface symptoms, tiny effects, wasted sample | Customer research first, then test big changes |
| **Assuming you know why visitors leave** | Teams are almost always wrong about motivations | Exit surveys, chat logs, support-ticket analysis |
| **Applying "best practices" unvalidated** | May not fit your audience, product, or context | Treat them as hypotheses to test, not rules |
| **HiPPO decisions** | Highest Paid Person's Opinion is not data | Let research and test results decide, not seniority |
| **Optimizing pages without funnel context** | Fixes shift problems elsewhere; misses biggest wins | Map the funnel, find blocked arteries, prioritize by impact |
| **Meek tweaks instead of bold changes** | Rarely reach significance; waste time and traffic | Test changes that could double conversion, not nudge it 2% |
| **Giving up after one failed test** | The opportunity still exists | Investigate why, return to research, try a bolder change |

## Quick Diagnostic

Audit any landing page or conversion flow:

| Question | If No | Action |
|----------|-------|--------|
| Do we know the ONE action visitors should take? | Page lacks focus | Define a single conversion goal; remove competing CTAs |
| Have we researched (not guessed) why visitors don't convert? | Optimization built on assumptions | Run exit surveys, analyze chat logs and tickets |
| Do we have an O/CO table? | Objections go unanswered | Build it from research; place counters at friction points |
| Is the value proposition clear within 5 seconds? | Visitors bounce before understanding | Run a 5-second test; rewrite headline in customer language |
| Are persuasion assets visible (testimonials, awards, guarantees)? | Claims without proof aren't believed | Audit assets, acquire missing ones, display prominently |
| Have we mapped the funnel for blocked arteries? | Optimizing the wrong page | Map traffic per stage, compare to benchmarks, prioritize |
| Is the path free of UX blockers (speed, mobile, form length)? | Friction kills converts who already decided to act | Fix load time, mobile layout, and over-long forms first |

## Further Reading

For the complete CRE Methodology(TM), detailed case studies, and advanced techniques:

- [*"Making Websites Win: Apply the Customer-Centric Methodology That Has Doubled the Sales of Many Leading Websites"*](https://www.amazon.com/Making-Websites-Win-Customer-Centric-Methodology/dp/1544500513?tag=wondelai00-20) by Dr. Karl Blanks and Ben Jesson

## About the Author

**Dr. Karl Blanks and Ben Jesson** are cofounders of Conversion Rate Experts, the agency whose CRE Methodology has doubled the sales of many leading websites -- clients include Google, Apple, Amazon, Facebook, and Dropbox -- and earned a Queen's Award for Enterprise (Innovation). Blanks holds a PhD and led usability teams at Hewlett-Packard; Jesson's background is direct-response marketing. Their book *Making Websites Win* distills the methodology into a repeatable, evidence-based process.