> I don't currently have a standard way to ask about this Typically I don't ask about the overall trend, but ask a bit about each of their last few jobs includ

> I don't currently have a standard way to ask about this Typically I don't ask about the overall trend, but ask a bit about each of their last few jobs including their reason for leaving each. (This works regardless of whether they've had many or few jobs.) Then you can decide whether you think there's a worrying trend (e.g. talking disparagingly about every single one of their many < 1- year jobs) or generally reasonable reasons for moving on.