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I know that questions about this topic have been asked before, but I didn't really find an answer that I could apply to our situation. We have several websites that now exist on separate domains, even though their topics are closely related. We are moving each of these sites into a new CMS and are considering collapsing all of the domains into a sub-domain structure around the strongest domain. Important to note: All of the current domains have existed for many years and have strong site authority, and regardless of the domain decision, in this restructuring we will be bringing them all under a global header. I know that there are SEO risks to moving a site from an established domain to a new one, even with 301 redirects in place, but the team in charge of this move wants to know how much of a hit we would take and how quickly natural search traffic might recover. Maybe and mights aren't really satisfying their questions... Does anyone have experience with collapsing domains into a sub-domain structure and feel like sharing your results? Most importantly, was it worth it???? Thanks.