I recently came across an old section on a site I manage which had a number of quite good Q&As, but each on separate pages. As they were related, I wondered if these could be combined on to one page, and if there was any advantage in doing so.
It seems the answer is yes, as long as they can be combined on to a page with a primary topic which is as strong as the individual pages. Apart from the new page having more content and perhaps being more authoritative, it will also gather all the links for the individual pages if the redirections are done properly.
If several short pages are being combined, I like the idea of having a table of contents at the top of the new page, linking to each component.