Khalid Saleh is CEO at Invesp, one of the first companies in North America dedicated to CRO that he founded back in 2006. He's also the co-author of an Amazon.com's bestselling book: "Conversion Optimization: The Art and Science of Converting Visitors into Customers, a book he published already 10 years ago. Khalid brings a ton of experience to the table and I’m glad to be talking to him today about the seemingly simple task of finding the things that are broken on your website. (oorspronkelijk gepubliceerd op https://www.cro.cafe/)
Recently I've seen some (often absolute) statements going around, generally in the line of "open source commerce platforms are a terrible idea". Now of course different solutions always have different pros and cons.
A hierarchy of evidence (or levels of evidence) is a heuristic used to rank the relative strength of results obtained from scientific research. I've created a version of this chart/pyramid applied to CRO which you can see below. It contains the options we have as optimizers and tools and methods we often use to gather data.