The first step is asking about their process. A good CRO firm won’t just suggest changes; they’ll test them, back everything with data, and explain their approach. Look for case studies with measurable results. Ask how they prioritize tests, how long their cycles run, and whether they handle implementation. You also want to see how they communicate. CRO requires collaboration, so you need a team that keeps you in the loop. Bonus points if they’ve worked in your industry or with businesses of a similar size and model.