Conversion & Experimentation

The cheapest growth is the traffic you already have

Doubling conversion rate is the same as doubling ad spend. Except you pay for it once instead of every month.

Conversion work has the best economics of anything in marketing and the worst survival rate as a program. Most testing operations die within six months, and the pattern is consistent: they test trivial changes, call winners on day four, and conclude that CRO is overhyped.

Both failures are avoidable. Trivial changes produce trivial results because a button color was never the reason someone didn't buy. Meaningful lift comes from testing offers, value propositions, page structure, and the friction the team assumed was necessary. And calling winners early inflates false positive rates well beyond the 5% the test is supposed to guarantee, which is why the sample size has to be calculated and committed to before launch.

The other thing teams miss is where the conversion event actually is. In SaaS it's inside the product, days after the marketing site did its job. Optimizing signup while activation leaks just acquires more people who churn faster. In e-commerce it's frequently delivery certainty and total-cost transparency instead of anything on the product page.

What decides outcomes here

Research before hypotheses

Guessed tests win about one time in ten. Tests built on session recordings, exit surveys and user testing win closer to one in three.

Calculate the sample size and commit to it

Peeking daily and stopping at first significance is the single most common methodological failure in commercial testing.

Losses are the point

About 69% of properly designed tests don't win. Each one tells you something true that contradicted a confident internal assumption.

Keep an insight library

Every test, hypothesis, result and conclusion written down. Within two years it's a genuine competitive asset and it stops you paying to learn the same lesson twice.

Reading

What we've published on conversion.

CRO8 min

The CRO tests that actually move revenue

About 69% of A/B tests don't win. The ones that do are almost never button colors. They're offers, value propositions, and friction the team assumed was necessary.

Rania Farouk

CRO8 min

Certainty beats persuasion

The highest-converting changes we ship are rarely more compelling copy. They're removing the uncertainty that made someone hesitate.

Rania Farouk

CRO8 min

The metric between acquisition and retention

Teams measure signups and they measure churn, then can't explain why the two don't correlate. The answer is usually the thing they're not measuring.

Rania Farouk

CRO9 min

The A/B test wins that disappear after launch

A test reports +9%. Production settles at +4%. The gap isn't a bug. It's the winner's curse, and it's inflating every test result you've ever shipped without checking.

Rania Farouk

CRO8 min

The lead-quality trap: fewer form fields, worse revenue

Every CRO playbook says cut form fields to lift conversion. A 140-lead form with 20 SQLs is a worse revenue engine than a 100-lead form with 30, even though the dashboard says the first one won.

Rania Farouk

Terms worth knowing

Full glossary

Contribution Margin

Contribution margin is what remains from a sale after subtracting every variable cost of fulfilling it: cost of goods, shipping, payment processing, discounts and returns.

CAC

CAC is the total cost of acquiring a new customer (advertising, salaries, tools and agency fees) divided by the number of new customers acquired in that period.

LTV

LTV is the total contribution margin a customer generates across their entire relationship with your business, not the total revenue they produce.

AOV

AOV is total revenue divided by total number of orders over a given period: the average amount a customer spends per transaction.

CAC Payback Period

CAC payback period is the number of months a customer takes to generate enough contribution to repay what it cost to acquire them.

Vacancy Cost

Vacancy cost is the total cost of a unit standing empty between tenants: lost rent for the vacant period plus turnover work, re-leasing fees, marketing spend and any discount needed to fill it.

Marginal CAC

Marginal CAC is the cost of acquiring one additional customer at your current spend level (the change in spend divided by the change in customers between two points), as opposed to average (blended) CAC, which is total spend divided by total customers.

CPA

CPA is the cost to generate one conversion within a specific channel or campaign (ad spend divided by conversions). It's narrower in scope than blended CAC, which includes every acquisition cost across the whole business.

Marketing Funnel

A marketing funnel is a model of the stages a prospect moves through between first becoming aware of a business and becoming a customer, usually awareness, consideration and decision.

Conversion Rate

Conversion rate is the percentage of visitors or users who complete a specific desired action (a purchase, a form fill, a sign-up), divided by total visitors, multiplied by 100.

Brand Awareness

Brand awareness is the extent to which a target audience recognizes or recalls a brand, typically measured through aided recall (recognizing a name when prompted) and unaided recall (naming a brand unprompted within a category).

Value Proposition

A value proposition is a clear statement of the specific value a customer gets from choosing a product or service, why that value matters to them, and why it beats every realistic alternative, including doing nothing.

USP

A Unique Selling Proposition is a single, specific claim about what makes a business truly different from every competitor. Not just different in wording, but different in a way a customer can independently verify and that competitors either can't or don't make.

Target Audience

A target audience is the specific group of people a marketing message, campaign, or product is deliberately built for. It's defined narrowly enough that messaging, channel choice and creative can be built around real, shared traits instead of generic appeal.

SWOT Analysis

A SWOT analysis is a strategic planning framework that evaluates a business or initiative across four categories: internal Strengths and Weaknesses, and external Opportunities and Threats.

Marketing Mix

The marketing mix is the set of controllable variables a business combines to position an offer in its market: classically Product, Price, Place and Promotion, sometimes extended with People, Process, and Physical Evidence for services.

Go-to-Market Strategy

A go-to-market strategy is the specific plan for how a new product or offering will reach its target customers, differentiate against alternatives, and convert interest into revenue. It covers audience, positioning, channels and launch sequencing together as one plan, not separate workstreams.

Customer Journey

The customer journey is the complete path an individual takes across every touchpoint, from first becoming aware of a business, through consideration and purchase, to ongoing use and potential advocacy. Not just the marketing-controlled portion of that path.

Lead Generation

Lead generation is the process of attracting prospects and capturing their contact information or expressed interest, converting anonymous audience attention into an identifiable, sales-pipeline-ready record.

Lead Magnet

A lead magnet is something useful a business offers for free, like a guide, tool, template or audit, in exchange for a visitor's contact details.

Content Marketing

Content marketing is creating and sharing useful content, like articles, guides, videos and tools, to attract, educate and keep customers, so they come to trust you before they buy.

Digital Marketing

Digital marketing is the promotion of a business, product or service through online channels, such as search engines, websites, social media, email and digital ads.

CRM

A CRM, or customer relationship management system, is software that stores information about customers and prospects and tracks every interaction with them, from first contact to sale and beyond.

Demand Generation

Demand generation is the set of marketing activities that build awareness of and interest in a problem or category, creating the pool of prospects that lead generation later identifies and captures. It delivers value before anyone is asked for their contact information.

Buyer Persona

A buyer persona is a semi-fictional representation of a specific type of individual buyer or decision-maker (their goals, concerns and behavior), built from real customer research to guide messaging and content decisions.

Brand Identity

Brand identity is the collection of visual and verbal elements (logo, color palette, typography, tone of voice, imagery style) that make a brand consistently recognizable across every place a customer encounters it.

Marketing Strategy

A marketing strategy is the set of high-level choices about which audience to target, how to position against alternatives, and where to compete. These are the decisions that determine which tactics make sense, not a list of the tactics themselves.

Call to Action

A call to action is the specific instruction (usually a button, link or line of text) that tells a visitor exactly what to do next, such as 'Start your free trial' or 'Book a call.'

Social Proof

Social proof is evidence (reviews, testimonials, customer logos, usage numbers, expert endorsements) that other people have already made the same choice, used to reduce a prospective buyer's perceived risk in making it too.

A/B Testing

A/B testing is a method of comparing two versions of a page, email or ad (a control and a variant differing in one changed element) by showing each to a separate group and measuring which produces a better result on a predefined metric.

Landing Page

A landing page is a standalone web page designed around a single, specific conversion goal (a sign-up, a purchase, a demo request), built for visitors arriving from a specific campaign or source instead of serving the general navigation purpose a homepage does.

Run the numbers

Conversion Lift ROIWhat a conversion rate improvement is worth versus buying the same revenue with ads.Sample SizeFind how long a test must run before you're allowed to look at it.Shipping ThresholdFind a threshold that lifts order value without absorbing more shipping than it earns.Discount Break-EvenFind how much extra volume a discount must produce just to stand still.

Where we do this work

CRO Web Development E-commerce

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