Americans sit through some 11 million meetings every day — with the unproductive ones costing companies an estimated $US37 billion a year.
We know that meetings tend to fall apart thanks to sloppy agendas and unclear ground rules, but what makes them successful?
We researched how some of the most effective executives in history — from the late Apple founder Steve Jobs to Amazon chief Jeff Bezos and Facebook COO Sheryl Sandberg — run the meetings that invariably fill their calendars.
Here’s what we found.
Disclosure: Jeff Bezos is an investor in Business Insider through hispersonal investment company Bezos Expeditions.
Sloan ran GM from the 1920s to the '50s. During that time he led GM to become the world's largest corporation -- in the '50s, GM held 46% of the US auto market and employed over 600,000 Americans.
Sloan is also credited with inventing modern corporate structure.
According to leadership guru Peter Drucker, the follow-up memo was one of Sloan's go-to tools.
After any formal meeting -- in which he simply announced the purpose, listened to what people had to say, and then left -- Sloan would send a follow-up memo with a plan of action.
(Sloan) immediately wrote a short memo addressed to one attendee of the meeting. In that note, he summarized the discussion and its conclusions and spelled out any work assignment decided upon in the meeting (including a decision to hold another meeting on the subject or to study an issue). He specified the deadline and the executive who was to be accountable for the assignment. He sent a copy of the memo to everyone who'd been present at the meeting.
These memos made Sloan an 'outstandingly effective executive,' Drucker argues, and you might say they were a key to GM's dominance of the 20th century.
Andreessen Horowitz cofounder and former Opsware CEO Ben Horowitz likes to have one-to-one meetings.
Back when he was a CEO, Horowitz led Opsware to a $US1.6 billion sale to HP in 2007.
Two years later, he cofounded Andreessen Horowitz, probably the most sought-after firm in venture capital.
Horowitz, who spends much of his time mentoring young leaders, says the most important job for a CEO is to architect the way people communicate in a company.
The one-to-one meeting is essential to that process, he says, as it's the best place for ideas and critiques to flow up from employees to management.
Here's his take on how to run one:
If you like structured agendas, then the employee should set the agenda. A good practice is to have the employee send you the agenda in advance.
This will give her a chance to cancel the meeting if nothing is pressing. It also makes clear that it is her meeting and will take as much or as little time as she needs.
During the meeting, since it's the employee's meeting, the manager should do 10% of the talking and 90% of the listening. Note that this is the opposite of most one-on-ones.
Musk has incredibly high standards, so if you're meeting with him at Tesla or SpaceX, you have to be ready.
As one anonymous Musk employee shares on Quora:
When we met with Elon, we were prepared. Because if you weren't, he'd let you know it. If he asked a reasonable follow-up question and you weren't prepared with an answer, well, good luck.
What else would you expect from the most badass CEO in America?
Sandberg brings a spiral-bound notebook with her to every meeting. In that notebook is a list of discussion points and action items.
'She crosses them off one by one, and once every item on a page is checked, she rips the page off and moves to the next,' Fortune reports. 'If every item is done 10 minutes into an hour-long meeting, the meeting is over.'
Parker doesn't just manage Nike's $US30 billion-a-year athletic empire, he brings his own designs. Parker walks into meetings with a Moleskine notebook under his arm -- full of his sketches of new products.
In 2009, cyclist Lance Armstrong was in a business meeting with Parker, who spent the whole time doodling in his notebook. At the end of the meeting, Armstrong asked to see what he drew.
'He turns the pad over and shows me this perfect shoe,' Armstrong recalls.
The doodles help clarify the brainstorming process, Parker says, one that's a constant balance between what design wants and what business needs.
'I think about balance a lot,' Parker says. 'Most of us are out of balance, and that's OK, but you need to keep your eye on the overall equilibrium to be successful.'
At any given meeting at Evernote, there will be someone there who doesn't belong.
This is by design. The cloud note-taking startup has an internal program called 'officer training,' in which employees get assigned to meetings that aren't in their specialty area to explore other parts of the company.
'They're there to absorb what we're talking about,' Libin, Evernote's executive chairman and former CEO, told the New York Times. 'They're not just spectators. They ask questions; they talk.'
Libin got the idea from talking with a friend who served on a nuclear submarine. To be an officer of such a sub, you had to know how to do everybody else's job.
'Those skills are repeatedly trained and taught,' he said. 'And I remember thinking, 'That's really cool.''
Winfrey is one of the wealthiest and most powerful women in the world. She's also one of the busiest.
Between running the Oprah Winfrey Network, publishing the Oprah Winfrey Magazine, and producing new TV series, she does not have time to waste in meetings.
'(I) really, really, really try to avoid meetings,' Winfrey told J.J. McCorvey in an interview for Fast Company. She prefers that her staff instead send her detailed emails.
She once spent 20 minutes on the phone convincing Coretta Scott King not to set up an in-person meeting with her. Winfrey told her: 'Whatever it is, I'm going to be more inclined to do it if you just ask me on the phone. Because if you come all the way here, if I don't want to do it, I'm still not gonna do it. And then you would have wasted your time, and I'm going to feel bad, and you're going to feel bad.'
'The senior leadership team of any company (has) got to stay on the same page,' he told The Journal. 'Any organisation can easily devolve into a bunch of silos.'
What are they doing for all that time? A Bloomberg Business story noted that Nadella keeps a dashboard that measures the performance of all his executives. It includes '
real-time graphs and data on financial performance to product usage,' and 'executives bring out the dashboards each Friday at senior leadership meetings to help coordinate efforts across business units.'
NOW WATCH: Ideas videos
Business Insider Emails & Alerts
Site highlights each day to your inbox.