This morning, Magento Inc. announced their new product 'Magento Go' (formerly known as 'Stratus'), as an addition to the current Magento product line including Community, Professional, Enterprise and Mobile at the first worldwide Magento Imagine event in Los Angeles.
Magento Go will be Magento's software as a service (SaaS) solution for retailers looking for a hosted e-commerce solution, much like Wordpress.com is a hosted blogging solution. You 'rent' the softwafe a pay for it with a monthly fee. There will also be a Magento Go Platform (Platform as a Service or PaaS) solution so developers can also work with Go and create extensions from it through OpenSocial and OAuth). Magento Connect will also get a relaunch to support Go. Great to know, is that extmensions made for one Magento version, will also be compatible with Go, so no need for time consuming/expensive addaptions for this new solution. It will (probably) be available to the public within a month and Magento is giving away 1 milion dollars worth of product accounts.
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.