Cross-examine the presenters of proposals. Think of how an attorney questions a witness:
How sure are you of this? Where did the evidence come from? What would happen if we
don’t pursue this? What is the upside and downside of the proposal?

So what?

This allows you and others to test the soundness of a proposal by judging the
quality of evidence, reasoning and projections. Also, by verbally justifying the proposal,
it helps the presenters to bolster their rationale or modify their proposal to be more