I'm looking for any research or information on best practices for designing interactions where users have to accept some legal terms and conditions. For instance - what are the advantages/disadvantages of presenting terms to the side of the main form vs. below or in a pop-up? Or - if the terms are going to be in a scrolling window, are there any guidelines about how big that window should be? How many lines should show at once relative to length of the whole agreement?
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