1. Ask them to do a presentation on a subject near and dear to their hearts to evaluate their ability to “tell” (many hiring managers do this today).
2. Ask them to perform a Discovery session with you, on a topic they know intimately such as their current company’s offerings, to evaluate their ability to “ask”. This is rather novel, I think, and may help to uncover presales people that are particularly strong at doing Discovery.
3. As them to present a demo based on what they learned in their Discovery session with you, to see how well they listened and incorporated what they learned into their demo – and to evaluate their demo-specific delivery skills (extra points for structuring their demo in a Great Demo! format, of course!).
This strategy gives you an opportunity to evaluate candidates’ ability to “tell”, “ask”, “listen”, and “show”.