During our Unconference in August (in Utrecht, The Netherlands) Sander and Guido had the pleasure to interview Sherrie Rohde about her work at Magento and what we can expect from her and her team in the coming year!
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.