He said the case had disclosed significant security flaws that made the initial, worst-case assumptions quite plausible.

I suppose the theory was that it was better to make a worst-case assumption.

Our job is to make worst-case assumptions.

Even the worst-case assumption has to be screened against that background.

He says it would make more sense to base the budget on a range of assumptions - best-case, worst-case and in-between.

Our impulse, though, is to be wary of arguments for rash action based on worst-case assumptions.

On the other hand, he emphasizes that he made gross worst-case assumptions.

One was a systematic pessimism that led to worst-case assumptions about Soviet intentions.

One authoritative group, using worst-case assumptions, estimated that a plane spreading anthrax over a big city might kill 100,000 people.

So the effect of vouchers would be neutral even when you start out with worst-case assumptions.