Dunbar number Concepts

The Vanishing Neighbor: The Transformation of American Community

by Marc J. Dunkelman · 3 Aug 2014 · 327pp · 88,121 words

Humans,” 685–86. 8Dunbar, “Coevolution of Neocortical Size, Group Size, and Language in Humans,” 684–85; http://www.businessweek.com/articles/2013-01-10/the-dunbar-number-from-the-guru-of-social-networks. 9R. A. Hill and R. I. M. Dunbar, “Social Network Size in Humans,” Human Nature 14, no. 1 (2003

Team Topologies: Organizing Business and Technology Teams for Fast Flow

by Matthew Skelton and Manuel Pais · 16 Sep 2019

/news/2017/10/devops-teams-good-or-bad. Beer, Stafford. Brain of the Firm, 2nd edition. Chichester, UK: John Wiley & Sons, 1995. Bennett, Drake. “The Dunbar Number, From the Guru of Social Networks.” Bloomberg.com, January 11, 2013. http://www.bloomberg.com/news/articles/2013-01-10/the

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-dunbar-number-from-the-guru-of-social-networks. Bernstein, Ethan, John Bunch, Niko Canner, and Michael Lee. “Beyond the Holacracy Hype.” Harvard Business Review, July 1, 2016.

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on Group Size in Primates,” 469–493. 6. Snowden, “The Rule of 5, 15 & 150;” Dunbar, How Many Friends Does One Person Need?; Bennett, “The Dunbar Number, From the Guru of Social Networks;” Burgess, Thinking in Promises, 87. 7. Snowden, “The Rule of 5, 15 & 150;” Karlgaard and Malone, Team Genius, 201

Liars and Outliers: How Security Holds Society Together

by Bruce Schneier · 14 Feb 2012 · 503pp · 131,064 words

volume of the neocortex correlates with the size of the troop. He established that the mean human group size is 150.14 This is the Dunbar number: the number of people with whom we can have explicit and personal encounters, whose history we can remember, and with whom we can experience some

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stuck in the Stone Age. The answer to that question will make use of the concepts presented in this chapter—the Red Queen Effect, the Dunbar number, our natural intelligence and murderousness—and it will make use of security. It turns out that trust in society isn't easy, and that we

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extended to strangers, animals, and sometimes even objects: religious objects, antiques, family heirlooms, etc. It probably didn't extend much past groups bigger than the Dunbar number of 150 until the invention of agriculture, about 10,000 years ago—I guess that's a fifth stage. Still, that doesn't tell us

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prevention—morals keeping most people honest, and informal detection, followed by punishment, leading to deterrence to keep the rest honest—starts to fail. Remember the Dunbar number? Actually, Dunbar proposed several natural human group sizes that increase by a factor of approximately three: 5, 15, 50, 150, 500, and 1,500—although

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more. If humans were incapable of developing these more formal societal pressures, societies either would have stopped growing or would have disintegrated entirely. Figure 5: Dunbar Numbers Agriculture required protecting resources, through violence if necessary. Luckily, two things happened. We invented institutions—government, basically—and we developed technology. Both of them allowed

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List database. A good way to think about it is that both institutional pressure and security systems allow us to overcome the limitations of the Dunbar numbers by enabling people to trust systems instead of people. Instead of having to trust individual merchants, people can trust the laws that regulate merchants. Instead

The Start-Up of You: Adapt to the Future, Invest in Yourself, and Transform Your Career

by Reid Hoffman and Ben Casnocha · 14 Feb 2012 · 176pp · 55,819 words

Wikipedia entry for Dunbar’s Number, http://en.wikipedia.org/wiki/Dunbar’s_number. Also see Christopher Allen’s nuanced parsing of the concept, “The Dunbar Number as a Limit to Group Sizes,” Life with Alacrity (blog), March 10, 2004, http://www.lifewithalacrity.com/2004/03/the_dunbar_numb.html 15

Loonshots: How to Nurture the Crazy Ideas That Win Wars, Cure Diseases, and Transform Industries

by Safi Bahcall · 19 Mar 2019 · 393pp · 115,217 words

., et al. “Open Peer Commentary on ‘Coevolution of Neocortical Size, Group Size and Language in Humans.’” Behav. Brain Sci. 16 (1993): 681. Bennett, Drake. “The Dunbar Number.” Bloomberg BusinessWeek, Jan. 14, 2013: 52. Bowman, Matthew Burton. The Mormon People. Random House, 2012. Brodhead, Richard H. “Prophets in America ca. 1830.” J. Mormon

Scale: The Universal Laws of Growth, Innovation, Sustainability, and the Pace of Life in Organisms, Cities, Economies, and Companies

by Geoffrey West · 15 May 2017 · 578pp · 168,350 words

and remain in social contact with them. This group typically comprises about 150 people. It is this number that is usually referred to as the Dunbar number that has gained a certain degree of attention in the popular media. You will notice that the sequence of numbers that quantify the magnitude of

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to other people, leaving no time for anything else. Imagine extending that to a New York or Tokyo. There is also the constraint of the Dunbar number, according to which we even have difficulty sustaining any sort of meaningful relationship with more than about 150 people, let alone a couple of hundred

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person operates in roughly the same amount of social and physical space in a city. This is in keeping with the implications of a “universal” Dunbar number and the space-time limitations on mobile activity in cities that we just discussed. Recall that the physical space in which we operate is spanned

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—those responsible for wealth creation, innovation, crime, and so forth—the inverse behavior is at play as was explained when we discussed the hierarchy of Dunbar numbers. The strengths of social interaction and the flows of information exchange are greatest between terminal units (that is, between individuals) and systematically decrease up the

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we live in groups that are as tightly knit as those in small towns or villages. This is a bit like the invariance of the Dunbar numbers I talked about in the previous chapter and, like those, probably reflects something fundamental about how our neurological structure has evolved to cope with processing

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Down Under: Canberra (Bryson), 266 drinking water, 360–63 drug dosages, 52–55 Duany, Andrés, 224 Dunbar, Robin, 305–9, 306, 315–16, 317–19 Dunbar numbers, 306, 319, 321, 324, 345 earthquakes, 45–47 East End (London), 224–26, 263–64 Ecological Society of America, 174 Ecology (journal), 174 economic diversity

Writing on the Wall: Social Media - the First 2,000 Years

by Tom Standage · 14 Oct 2013 · 290pp · 94,968 words

the human neocortex, the average group size for humans should be 148, which he rounded to 150. This number, which has become known as the “Dunbar number,” does indeed seem to recur frequently in human societies. It is the average population of a hunter-gatherer clan, of the earliest farming settlements in

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with quires a police force; but below the 150-person limit, order can be maintained by peer pressure alone, because everyone knows each other. The Dunbar number is also the typical size of a military company, which generally includes between 120 and 180 individuals. A company in which everyone knows everyone else

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dollars. Pinterest lets users collect and share images in digital scrapbooks, or pinboards. Path is a mobile-only social network that limits users to the “Dunbar number” of one hundred and fifty friends. Medium, the latest venture from Evan Williams, is akin to both a magazine and a shared blogging platform. Branch

Grouped: How Small Groups of Friends Are the Key to Influence on the Social Web

by Paul Adams · 1 Nov 2011 · 123pp · 32,382 words

to now” for an overview. 5. For a great overview (with data) of Dunbar’s number and online games, see Christopher Allen’s post “The Dunbar number as a limit to group sizes” on his blog Life With Alacrity. 6. For lots of detail about group dynamics, see David Brook’s book

War

by Sebastian Junger · 15 Nov 2010 · 251pp · 79,822 words

size for a group of humans. The number he came up with was 147.8 people. Rounded up to 150, it became known as the Dunbar number, and it happened to pop up everywhere. A survey of ethnographic data found that precontact hunter-gatherers around the world lived in shifting communities that

The Life and Death of Ancient Cities: A Natural History

by Greg Woolf · 14 May 2020

up to ten houses remained the largest kind of settlement for around two thousand years. The population of each village was usually less than the Dunbar number, the supposed maximum number of individuals with which each of us can maintain individual social relations. These were small worlds indeed. During the following millenia