"Or some progress with setback determined by the GM."I also need to bring up that there are a LOT of checks where there's nothing by the rules stopping every single member of the party from rolling to attempt the task at hand. Perhaps things like deception or diplomacy might be problematic if more than one person attempts it, but perceptions, investigations, knowledge checks such as arcana, athletics checks or STR checks to force something open or move something heavy, etc. -- ALL of these could simply have the whole party keep trying until they succeed, via a dumb luck check. In these cases, working together works beautifully, because it covertly makes multiple players spend their actions giving someone advantage rather than spending tons of table time re-rolling and re-re-rolling. Same thing with the variant rule of "auto succeed if person attempting has an ability score greater than or equal to DC+5". The fewer rolls, the better, and what better way than saying, "oh, if you help this person they get advantage" or "You have a 16 STR? Oh, that DC 10 door is no problem for you!"
In my experiences, it not only simplifies the attempts, it quickly resolves the success or failure of the whole thing, so they can decide what their next course of action is.
Almost a quote if not one.
That's the second part of what a failure on an ability check is as defined by the PHB.
Perception &Investigations - you did notice A but while you were looking you failed to spot B or got noticed by C. Whether that means your pocket got picked in the bar while you looked for cultists or you were spotted and tracked by others etc... whole tons of options.
Knowledge checks - recall some good info and some misleading info.
Athletics/strength - damn, should a maybe not did that last bit... pulled something - take a level of exhaustion for the exertion... or dang got it shifted then slipped now it's a little further but wedgedvin so future checks are harder or disadvantaged. Or maybe it gave a little but stuff now is falling - noise, debris, damage.
Failure on ability checks in 5e is **not** imited ever to binary pass fail repeat - at least not as defined in the PHB under ability checks.
Edit to add cite from PHB
'If the total equals or exceeds the DC, the ability check is a success — the creature overcomes the challenge at hand. Otherwise, it's a failure, which means the character or monster makes no progress toward the objective or makes progress combined with a setback determined by the DM."
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