My former colleague June Cohen framed the difference this way: An issue-based talk leads with morality. An idea-based talk leads with curiosity. An issue exposes a problem. An idea proposes a solution. An issue says, “Isn’t this terrible?” An idea says, “Isn’t this interesting?” It’s much easier to pull in an audience by framing the talk as an attempt to solve an intriguing riddle rather than as a plea for them to care. The first feels like a gift being offered. The second feels like an ask.
