As more employees return to the office , some CEOs are finding they need to reteach basic meeting etiquette —including one surprisingly divisive topic: checking your devices. JPMorgan Chase CEO Jamie Dimon has been especially blunt about it.

At Fortune’s Most Powerful Women summit last month, he said he expects full attention from everyone in the room. “If you have an iPad in front of me and it looks like you’re reading your email or getting notifications, I tell you to close the damn thing,” he told Fortune Editor-in-Chief Alyson Shontell . It’s disrespectful.”

IBM CEO Arvind Krishna , however, sees it a bit differently. He argued that it would be “weird” for a tech company to tell its employees not to use their technology—especially in larger meetings where devices can

See Full Page