Conversion Rate Optimisation: How to Run a CRO Test From Idea to Result
The conversion rate optimisation process runs in five steps: research to find where visitors drop off, form a clear hypothesis about what change will help and why, build and run a controlled test (often an A/B test) until it reaches statistical significance, analyse the result honestly, and implement winners while learning from losers. CRO is a disciplined, evidence-based cycle, not random guessing about which button colour might work.
A practical guide to the conversion rate optimisation (CRO) process for South African businesses: how to find ideas, run tests properly, and act on results.
TL;DR: Quick Answer
Basic South African brochure sites: R8,000-R20,000. Custom business websites with SEO and copywriting: R20,000-R50,000. E-commerce: R40,000-R150,000+. The five cost drivers that create the biggest price variation are: scope and number of pages, custom vs template design, professional copywriting, integrations (payment gateways, booking systems, CRM), and on-page SEO included at build stage. Always add 15-25% for hosting, maintenance and content updates in year one.
Key takeaways
- Very cheap quotes (under R5,000) almost always exclude copywriting, SEO, custom design and post-launch support
- Professional copywriting can represent 20-35% of a total website project cost, and is worth it for search visibility
- On-page SEO built into the website at launch costs a fraction of what it costs to retrofit after the site is live
- Hosting, SSL, domain and maintenance add R3,000-R10,000 per year on top of build cost
- E-commerce adds significant cost due to payment gateway integrations, product data, security requirements and checkout UX
- Timeline and client responsiveness directly affect cost: slow feedback rounds extend agency hours
Summary
Conversion rate optimisation is how you get more customers from the traffic you already have, often the cheapest growth available, because you are not paying for more visitors. But CRO done as random guesswork usually fails. This guide lays out the proper CRO process: research, hypothesis, controlled testing, honest analysis and implementation, so your optimisation is evidence-based and your wins are real rather than imagined.
What CRO is and why it pays
Conversion rate optimisation is the practice of systematically improving the percentage of your visitors who take a desired action, buying, enquiring, subscribing, by testing changes to your site and keeping what works. Its appeal is simple economics: if you double your conversion rate, you double your results from the same traffic and the same ad spend. That makes CRO one of the highest-leverage activities in digital marketing, because it multiplies the value of everything else you do.
Step 1: Research where visitors drop off
Good CRO starts with evidence, not opinions. Before changing anything, find out where and why visitors are failing to convert:
- Analytics: identify pages with high traffic but low conversion, and where people exit
- Heatmaps and session recordings: see where people click, how far they scroll, and where they get stuck
- Funnel analysis: find the exact steps where people abandon, like a checkout stage
- Direct feedback: surveys and customer input on what confused or stopped them
Research first: The biggest CRO mistake is testing random ideas. Research tells you where the real problems are, so you test things that actually matter.
Step 2: Form a clear hypothesis
A hypothesis turns a vague idea into a testable statement. A good one names the problem, the change, the expected effect and the reason: 'Because visitors are not reaching the form (research shows they do not scroll far enough), moving the enquiry form higher up the page will increase enquiries.' This discipline forces you to think about why a change should work, and it makes the result meaningful whether the test wins or loses.
Step 3: Run a controlled test
The reliable way to know whether a change helps is a controlled test, usually an A/B test: show the original (control) to half your visitors and the changed version (variant) to the other half, at the same time, and measure which converts better. Crucially, change one meaningful thing at a time so you know what caused any difference, and run the test long enough to reach statistical significance, so the result is real rather than random noise. Ending a test too early is one of the most common ways businesses fool themselves.
Step 4: Analyse honestly
When the test concludes, read the result honestly. Did the variant genuinely beat the control with enough data to trust it? Be wary of declaring victory on a tiny sample or a marginal difference. Equally, a 'losing' test is not a failure, it is a learning: it tells you something about your audience that sharpens your next hypothesis. The goal is truth, not the satisfaction of being right.
Step 5: Implement, then keep going
Implement winning changes permanently, and feed everything you learned, wins and losses, into your next hypothesis. CRO is a continuous cycle, not a once-off project: research, hypothesise, test, learn, repeat. Over time, this disciplined loop compounds into substantially higher conversion rates, which means more customers and revenue from the same traffic. The businesses that win at CRO are the ones that treat it as an ongoing practice rather than a single experiment.
Related Juicy Designs resources
- Conversion rate optimisation services
- Conversion rate optimisation in South Africa
- A/B testing guide for SA businesses
- Landing page best practices for SA
Frequently asked questions
What is conversion rate optimisation (CRO)?
CRO is the practice of systematically improving the percentage of visitors who take a desired action, such as buying or enquiring, by testing changes to your site and keeping what works. It increases results from your existing traffic without paying for more visitors.
What are the steps in the CRO process?
Five steps: research where visitors drop off, form a clear hypothesis about what change will help and why, run a controlled test such as an A/B test to statistical significance, analyse the result honestly, and implement winners while learning from losers.
What is a CRO hypothesis?
A hypothesis is a testable statement naming the problem, the change, the expected effect and the reason, for example: because visitors do not scroll far enough to reach the form, moving it higher will increase enquiries. It makes tests meaningful whether they win or lose.
What is an A/B test?
An A/B test shows the original version of a page to half your visitors and a changed version to the other half at the same time, then measures which converts better. Changing one meaningful thing at a time tells you exactly what caused any difference.
Why do CRO tests need statistical significance?
Because without enough data, an apparent winner may just be random noise. Running a test to statistical significance ensures the result is real and repeatable. Ending tests too early is one of the most common ways businesses fool themselves about what works.
Is CRO a once-off project?
No. CRO is a continuous cycle of research, hypothesis, testing, learning and repeating. Wins and losses both feed the next hypothesis, and over time the disciplined loop compounds into substantially higher conversion rates.