Manbearcat
Legend
Just based on the language and flow of your example, I believe my play style is quite different from the one presented (it have to admit, I had some trouble following the details for some reason). When you say "greater intent of sating motivation X" I am not 100% sure I know what you mean. But social rolls are probably not the best example for me, as I place a lot more emphasis on what the player character is saying and doing than on a roll for that (for me, social rolls are things I invoke when there is just a lack of clarity on how the NPC might react). But that said, let's say a player character meets a scholar-official on the road and has some interest in becoming that scholar officials student (I am assuming this would be his "greater intent of sating motivation X"). And he tried to present himself as a well educated man, with a thorough training in the classics in order to impress the scholar official (and let's say this isn't true, the character has only a passing knowledge of the classics). I'll let the player say what he is going to so, but then I might make him make a Deception roll to see if he observes all the correct formalities and subtle expectations. If he fails, this scholar official is not going to buy his story.
However, whether combat ensures, whether the NPC remains open to a relationship down the road, whether they become adversaries, that is all going to be a product of the NPCs motives, goals and how those interact with the actions of the player character. The failed deception roll would be a factor, because the player just lied to him and that might not paint the character in the best light. But rarely would such a roll tell me how their relationship is going to pan out for the rest of the session or the rest of the campaign, it only tells me what happened in that one instance and that feeds the bigger picture of things. I'm not going to have the scholar official respond in some way that meets the players desire for a particular motivation though. It is going to be dependent on what seems like an appropriate reaction based on what happens.
I think we're in the same general orbit of "being on the same page" at this point. And I'm fairly confident (given the above post and your posting history) that you are not someone who would be inclined to either (a) use Fail Forward as a general technique for determining how the situation changes, post-action-resolution, or (b) run games that systematize its usage.
Since you've expressed that you're still uncertain, I'm going to create a truly bare bones example (to remove any potentially obfuscating details and because of your take on social mechanics):
- Bob (PC) wants pudding.
- Mount Pudding has pudding at its peak.
- Bob therefore summits Mount Pudding (action) to retrieve said pudding (intent).
A game where the technique of Fail Forward is deployed puts the retrieval of the pudding as the reference-point by which the fictional results of action-resolution are anchored/contextually framed. As Bob attempts to summit Mount Pudding, whenever Bob's player fails a roll involved with the physical effort to summit Mount Pudding, the GM changes the situation. However, the GM does not do so by solely referencing the causal logic chain of the action undertaken, say, a failed hazard navigation check:
Bob, you fall into the crevice (with whatever mechanical result)!
They may do that if it is sufficient to create an interesting setback to the retrieval of said pudding. However, the GM may also change the situation by tying the setback directly to the retrieval of said pudding. Failed hazard navigation? Crap:
Bob, you barely escape disaster by grabbing the edge of the crevice before you fall down into the deep dark (!)...but the leather strap holding your Pudding Divining Rod to your belt tears free and you hear the awful sound of it clanging off the rock as it cascades down...down...down (oh no!). You going down after it or do you think you can find that dastardly evasive pudding without it?
The latter is Fail Forward. Action succeeds (Bob evades the hazard) while intent is compromised/complicated (retrieval of said pudding).