Interview with me about being selected as a Magento Master. Recorded at Magento Imagine Las Vegas in March 2019, published on https://magento.com/blog/technical/magento-masters-spotlight-guido-jansen on January 8th 2020.
See for full intreview: https://magento.com/blog/technical/magento-masters-spotlight-guido-jansen
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.