NED23 – 6.1.1. Further Reading
I personally do think multiple instances of a group of 5 while testing would come out different then testing 15 users at once, I think if a company was to hire 15 people at one time to test and after the test found many errors what if the site had a re-design to fix errors and more errors came a long then the company would have to re-hire 15 people again but if they split the 15 into 3 groups and have 5 users per group at different intervals of fixing the site then I’m sure a better outcome would come from it with less errors then only doing the test once.
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