Performance Based Development Systems.
It's a way of assessing someone's clinical ability using short (like, 15 to 20 seconds maybe a little longer) vignettes. They might give you some lab results, or some medications that the "patient' is "taking." If there is dialog, you get the transcript.
Then you are supposed to provide appropriate responses, or interventions, with rationales. When I took the med surg one, they said put the interventions in order of importance. When I did the psych one, well, let's just say the lady giving it is a couple of pickles short of a picnic, so I don't know if it was supposed to be in order of importance and she just forgot, or what.
People make a big deal out of it, but I thought it really wasn't too bad. I mean, it's a test. You pass it or you don't. When I got ready to take my med surg PBDS, I was interning on a telemetry floor and the supervisor said, "don't worry, everybody fails the first time." I wasn't as rattled about it as I might have been, given what he said, and I passed. And people say I don't have enough clinical experience (for a new grad? how much is that, anyway?), so maybe it isn't a good measure, since I passed.
But my clinical instructors said I was a natural, and I got all A's on my exams (second pass--first pass I had a solid B average), so who am I to say?
But that's what PBDS is.