The first phase is where most mistakes occur Even if this were true, which I wouldn't argue against, it doesn't mean that it's where the mistakes of the highes

The first phase is where most mistakes occur Even if this were true, which I wouldn't argue against, it doesn't mean that it's where the mistakes of the highest aggregate value occur. For example, what percentage of first phase rejections try again, as compared with second phase rejections? But the trouble with that is that, unlike funding, interview slots are constrained. You could apply the usual interview scaling technique of adding another phase (e.g. shorter pre-screen with a single interviewer) or delegating. This has the obvious disadvantages, which is, arguably, one of the major reasons big company hiring processes are so unreliable.