A working reference for the terms we use across the Precision blog and audits. Definitions are written to be useful first, accurate second, and Google-friendly third. Where a term has a dedicated article, the entry links to the deep dive.
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The foundational vocabulary for measuring and improving how visitors turn into customers.
The systematic practice of increasing the percentage of website visitors who complete a desired action, such as making a purchase, signing up, or contacting sales. CRO is grounded in data, behavioural psychology, and structured experimentation rather than design preference or guesswork.
Deep diveThe percentage of visitors to a website who complete a specific desired action within a defined time window, calculated as completed actions divided by total visitors. A useful benchmark sits at 2 to 3% for e-commerce, but the meaningful number is always category-specific.
Deep diveA controlled experiment in which two versions of a page or element (the control and the variant) are shown to comparable audience samples to measure which produces a higher rate of a defined goal. A/B testing replaces opinion-based decisions with statistically validated evidence.
Deep diveAn experimentation method that tests combinations of multiple page elements simultaneously to identify which combination produces the strongest result. Multivariate testing requires substantially higher traffic than A/B testing to reach statistical significance, which is why most growth-stage stores should sequence A/B tests before adopting MVT.
Deep diveThe level of confidence that a test result reflects a real difference rather than random chance. Most CRO programmes use a 95% confidence threshold, meaning there is a 5% or smaller probability the observed difference happened by accident. A result without significance is noise, not a finding.
The percentage of people who click a link, button, or ad out of the total who saw it. In e-commerce, CTR is most useful at the SERP level (snippet CTR), the email level (campaign CTR), and the product card level (category-to-product CTR).
The tools and signals used to understand what visitors are actually doing on a page.
A visual aggregation of visitor behaviour across many sessions, typically showing where people click, how far they scroll, and where their cursor lingers. Heatmaps surface page-level patterns at scale. They are silent on why any individual visitor behaved a particular way.
Deep diveA playback of an individual visitor's session, capturing their mouse movement, clicks, scroll behaviour, form interactions, and page transitions. Recordings answer the why behind a problem page that heatmaps identified. Best used after heatmaps, not before.
Deep diveThe percentage of visitors who leave a site after viewing only one page, without taking any further action. A high bounce rate on a content page can be normal. A high bounce rate on a product or category page usually signals a relevance or hierarchy problem.
The length of time a visitor spends on a page before returning to the search results or leaving. Google uses dwell time as a behavioural quality signal: longer dwell time on a page that ranks for a query suggests the page meaningfully answered the searcher's intent.
The point in a multi-step user journey (typically product page to cart to checkout to purchase) where visitors are most likely to abandon the flow. Identifying the largest drop-off step is the first move in any CRO audit, because it tells you where the highest-leverage fix lives.
A rapid sequence of clicks on the same element within a short time window, indicating that a visitor expects something to happen and it is not. Rage clicks are one of the highest-signal behavioural diagnostics: they identify broken interactions that visitors care enough about to insist on.
The revenue-side numbers that decide whether a CRO programme is paying back.
The mean revenue generated per completed transaction, calculated as total revenue divided by number of orders within a given period. AOV is one of the highest-leverage levers in e-commerce because it improves revenue without requiring additional traffic or higher conversion rates.
Deep diveThe deliberate practice of increasing average order value through tactics like product bundling, free-shipping thresholds, post-purchase upsells, and price anchoring. AOV optimisation typically yields revenue lift faster than conversion rate improvement because it acts on customers already past the buying decision.
Deep diveThe percentage of shoppers who add items to their cart but leave the site without completing the purchase, calculated as abandoned carts divided by total carts created. The Baymard Institute has tracked the global average at roughly 70% across e-commerce categories.
Deep diveThe conversion rate specifically attributable to mobile traffic. Mobile typically converts at half the desktop rate across e-commerce, despite mobile generating over 60% of traffic. The gap is the single largest recoverable revenue source in most stores.
Deep diveA composite metric calculated as total revenue divided by total visitors, capturing both conversion rate and average order value in one number. RPV is often more honest than conversion rate alone because it reflects what each visitor is actually worth to the business.
The behavioural principles that explain why people buy, hesitate, or leave. CRO without psychology is design preference.
The principle that people look to the behaviour of others when uncertain about their own decision. In e-commerce, social proof shows up as customer reviews, star ratings, customer counts, recent purchase notifications, and trust badges. Effective social proof is specific and recent, not generic.
Any on-page element that reduces a buyer's perceived risk at the moment of decision: reviews, security badges, returns policies, payment logos, customer counts. The effectiveness of a trust signal depends almost entirely on its placement: at the buying decision, not in the footer.
Deep diveThe behavioural finding that the pain of losing something is roughly twice as strong as the pleasure of gaining the equivalent thing. Loss aversion is why limited-time offers, low-stock indicators, and free-returns guarantees move conversion: each one reframes the decision as something to lose rather than something to gain.
A cognitive bias in which the first number a person encounters disproportionately influences their judgement of subsequent numbers. Anchoring is why a £120 reference price next to a £89 sale price reads as a deal, and why a premium bundle on a product page makes the standard option feel reasonably priced.
The mental effort required for a visitor to process and act on information. High cognitive load (too many choices, unclear hierarchy, dense copy) reduces conversion because the brain treats effort as a reason to stop. Reducing cognitive load is one of the most consistent CRO levers across every kind of store.
Anything that increases the effort required to complete a purchase: an extra form field, an unclear button, a forced account creation, a hidden cost reveal at checkout. Friction is the most consistent predictor of abandonment. The CRO mindset treats friction removal as the default move before any new feature.
The principle that perceived rarity increases desire and accelerates decisions. In e-commerce, scarcity shows up as low-stock indicators, limited editions, and countdown timers. Honest scarcity converts. Fabricated scarcity erodes trust and is increasingly easy for buyers to identify.
The principle that a time-bound decision feels more compelling than an open-ended one. Urgency reduces the option to defer, which is the most common silent killer of conversion. Like scarcity, urgency must be real to remain credible.
The most reliable moves in a CRO programme, in roughly the order most stores should apply them.
The process of reducing friction and uncertainty across every step of the checkout flow: removing unnecessary fields, surfacing costs early, offering guest checkout, placing trust signals at the card-entry field, and supporting mobile wallets. Checkout typically holds the largest single recoverable revenue gap in any store.
Deep diveThe page where most buying decisions are made or lost. A high-converting product page handles hero imagery, benefit-led headline, price, star rating, returns visibility, and the Add to Cart button above the fold on every device. Most stores have the right elements but the wrong hierarchy.
Deep diveA standalone page designed to convert a specific traffic source into a specific action, typically paid traffic into lead or sale. Landing pages succeed or fail in the first viewport: the headline, the proof point, and the visible CTA decide whether visitors scroll or leave.
Deep diveOften treated as a junction between product and checkout, but actually a decision point in its own right. Cart pages either reinforce the purchase (trust, total clarity, low-friction edit) or undermine it (surprise costs, confusing controls, distracting cross-sells).
Deep diveThe minimum order value at which shipping becomes free, set deliberately above the current AOV to nudge buyers toward larger baskets. Effective thresholds are reinforced with a progress bar in the cart, so the gap between current spend and free shipping is always visible.
Combining related products into a single offer at a price that reframes the perceived value compared with individual purchases. Bundling raises AOV without discounting because grouping changes how buyers process value, not the value itself.
Deep diveOffering a higher-value or premium alternative to the product a buyer has already chosen, usually presented as the better option for their existing intent. Upsells succeed when they preserve relevance and feel like a recommendation, not a sales push.
Suggesting complementary products that pair with the buyer's current selection (a case with a phone, a strap with a watch). The best cross-sells reduce decision effort by completing an obvious need rather than introducing a new one.
The infrastructure-side terms that affect both search rankings and conversion rate, often at the same time.
How quickly a page loads and becomes interactive for the visitor. Page speed affects both Google rankings (as part of Core Web Vitals) and conversion rate directly: every additional second of load time is a measurable conversion loss, and the effect compounds across the funnel.
A specific set of Google-defined page experience metrics covering loading performance (Largest Contentful Paint), interactivity (Interaction to Next Paint), and visual stability (Cumulative Layout Shift). Core Web Vitals are part of Google's ranking algorithm and a direct signal of perceived quality for visitors.
The total quality of a visitor's interaction with a site across visual design, information architecture, interaction patterns, performance, and accessibility. UX and CRO overlap heavily but are not identical: UX optimises for ease and clarity, CRO optimises specifically for a measurable business outcome.
The portion of a page visible to a visitor without scrolling, on whichever device they are using. On mobile, the fold is significantly shorter than on desktop. The hierarchy of what sits above the fold (headline, image, price, CTA, proof point) decides whether the visitor scrolls or leaves.
Google's quality framework for evaluating content: Experience, Expertise, Authoritativeness, and Trustworthiness. For e-commerce and consultancy sites, E-E-A-T is reinforced by named authors with verifiable credentials, real-world results, transparent sourcing, and clear business identity.
Most stores already use half of what is on this page. The gain is in the order and placement. A Precision Deep Dive Audit maps your specific funnel against this vocabulary in a week.
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