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Message: <blockquote data-quote="Flights of Fancy" data-source="post: 9668632" data-attributes="member: 7037975">I thought you were talking about that part, but wanted to make certain.The bonuses (i.e. proficiency+) are assumed. We don't use this if you aren't proficient or have a +5 ability. The way it came into being was through attacking. At 1st level, most PCs are +5, so if they roll 15, they hit AC 20. Very few games are going to have AC over 21, so it is a very safe bet that if you roll 15, you're gonna hit. At the other end, since the minimum AC is often 10 (often higher), a roll below 5 means you missed. So, it is also a safe bet that rolling 5 or lower fails.Since most skill checks run in the 10-20 range as well, it works for those, too. In your example, Bobby at +8 cannot fail a DC 5 check so the DM would never even call for a roll--it would be pointless and a waste of time.And to be clear, it is a "general rule of thumb" sort of houserule. Sure, sometimes it might mean someone makes a roll when technically they should have failed by 1, or fails a roll technically they should have made, but frankly it speeds up the game A LOT for our group--its purpose for being--so is actually a really good house rule.</blockquote>