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Message: <blockquote data-quote="Nagol" data-source="post: 5994977" data-attributes="member: 23935">I can see certain advantages of the mechanic compared to bonus/penalty adjustments,First, the range of outcomes isn't extended.  The range remains 1-20.  No need to consider what a 28 result looks like.  This helps with bounded accuracy -- you know the maximum any attempt can achieve.Secondly, advantage affects low initial rolls disproportionately.  Under a bonus scheme, a +3 bonus offers the same change regardless of whether a 2 or a 19 were rolled.  Imagine rolling the two dice sequentially.  If you roll a 20 on the first die, you know there is no possible improvement from the second one.  If you roll a 1 on the other hand, you know that 95% of the time your result will improve and your expected improvement is +9.5.Thirdly, it affects how frequently a 1 or a 20 result appears.  This can have cascade effets on any form of critical hit / critical failure results -- or even auto-hit/auto-fail that a bonus scheme doesn't duplicate.</blockquote>