Conversion rate optimisation

Conversion rate optimisation, usually shortened to CRO, is the process of understanding why people act or hesitate on a website and using that evidence to improve the journey. The goal is to help more suitable visitors complete a worthwhile action, such as making a purchase or submitting a qualified enquiry.

It brings together research, copy, design, development and measurement. A stronger headline can be part of it. So can fixing a confusing booking form, explaining delivery information earlier or making a pricing page easier to compare. The starting point is a problem in the journey, followed by a reasoned explanation of how to improve it.

How does conversion rate optimisation work?

A useful CRO process moves through five stages: define the outcome, investigate the journey, form a hypothesis, make or test a change, and review the result. Each stage reduces a different kind of uncertainty.

Defining the outcome establishes what success means. Research helps explain what might be preventing it. A hypothesis connects the evidence with a proposed change. Testing or monitored implementation shows what happened. Reviewing the result determines whether to keep, refine or reverse the change.

The process is ongoing because audiences, offers and businesses evolve. A journey that worked for an early product range may become less useful after a business adds new services or targets a different market.

Start with a meaningful conversion

Before changing a page, choose the action you want to improve and the audience you want to improve it for. “Get more conversions” is too broad if the website treats an article scroll, a brochure download and a sales enquiry as equivalent successes.

A stronger objective might be to increase completed consultation requests from suitable businesses, without reducing the share accepted by the sales team. For a shop, it might be to improve completed orders while protecting margin and keeping refunds within an acceptable range.

These supporting measures are guardrails. They help ensure a local improvement does not create a larger problem elsewhere. Read our guide to conversion rate for the underlying calculation and reporting distinctions.

What research is useful for CRO?

Quantitative evidence shows where a problem may exist. Useful sources include page-level analytics, form completion data, checkout stages, device breakdowns and campaign performance. A sharp drop between starting and submitting a form suggests a different investigation from a page that few visitors reach.

Qualitative evidence helps explain why. Customer interviews, sales conversations, support questions and observed usability sessions can reveal uncertainty that a dashboard cannot name. People may not understand what is included, whether the business serves their area or what happens after submitting an enquiry.

Heatmaps and session recordings can provide additional clues when collected and used appropriately. They still need interpretation. A frequently clicked image might indicate interest, confusion or an expectation that it opens something. Observation should lead to a question that can be investigated.

How to write a useful CRO hypothesis

A hypothesis should connect an observed problem, a proposed change and an expected effect. For example: “Visitors frequently ask whether installation is included. Explaining the installation scope beside the enquiry button may reduce uncertainty and increase qualified enquiries.”

This is more useful than “make the button brighter”. It records the reasoning and makes the result easier to interpret. If the change does not help, the team can reconsider whether uncertainty about installation was the real obstacle.

Prioritise hypotheses using likely impact, confidence in the evidence and implementation effort. A broken mobile form is usually a more immediate concern than a subtle visual preference on a page with little traffic.

What is the role of A/B testing?

An A/B test compares versions of an experience using deliberately assigned groups. Its purpose is to estimate whether a change caused a difference in the chosen outcome. A useful test needs a defined primary measure, reliable tracking and a suitable sample for the effect the business wants to detect.

Decide how the test will be evaluated before it begins. Repeatedly stopping when an early result looks favourable can produce misleading conclusions unless the method explicitly accounts for that approach. Large percentage changes based on a handful of conversions deserve particular caution.

Testing also needs commercial interpretation. More form submissions may be an encouraging signal, but follow the leads far enough to understand their quality. The winning design should support the business rather than simply win the easiest metric.

Can you do CRO on a low-traffic website?

Yes, although a conventional A/B test may take too long to provide a useful answer. A specialist B2B website can generate valuable opportunities from relatively few visits, which makes the work worthwhile while limiting the statistical evidence available.

In that situation, use customer research, usability observation, technical checks and sales feedback to identify clear problems. Implement well-supported improvements, record the date and monitor relevant outcomes. Be honest that a before-and-after comparison cannot isolate the design change from seasonality, campaign changes or other influences.

Some fixes do not need an experiment to establish that they are necessary. If a required field rejects valid phone numbers, correcting the error restores an intended function. The follow-up question is whether the whole journey now works reliably.

Common CRO mistakes

One mistake is copying another website without understanding its audience. A short form may work for a simple purchase while leaving a specialist sales team without the information it needs. Another is changing several major parts of a journey at once and then attributing the result to a single detail.

False urgency and misleading interface choices can increase immediate actions while damaging trust. Clear information, honest expectations and an understandable next step give a business a more sustainable basis for improvement.

A third mistake is treating CRO as a design exercise detached from acquisition. A landing page will struggle if the campaign attracts the wrong people. Review the promise in the advert and the visitor's search intent alongside the destination.

What should a CRO review produce?

It should produce a clear diagnosis, prioritised opportunities and a measurement plan. Each recommendation should explain the affected audience, the evidence, the proposed change and the expected outcome. The result is a practical queue of work rather than a long list of aesthetic preferences.

For a business planning a larger rebuild, this evidence can also shape the brief. It helps distinguish problems that require better messaging, stronger content or a different structure from problems that require a new technical approach. Explore Linford websites to see how those decisions can come together.