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Some sensible interaction design

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Some sensible interaction design principles:

Remove or disable submit buttons on clicking to avoid double submissions
On transitions should be fast (to feel zippy). Out transitions can be slow
Keep essential information out of tooltips

Published 10 Feb 2013

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What is Dunbar's number example explained: a person can't remember the name of the one person outside their circles of closer friends, super family, clan and tribe behind them

Dunbar’s number: 150

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The evolutionary psychologist Robin Dunbar identified that an average person’s social network appears to follow simple scaling laws. Our networks grow from our closest friends—whom we would seek personal advice or help from in times of severe emotional and financial distress—through our superfamily (or close friends), to our acquaintances (or clan), whom we might invite to a party, and to our most casual friends (or tribe). At each level, the number of people typically increases by about a factor of 3. So you might have 5 close friends, 15 in your superfamily, about 50 in your clan and about 150 in your tribe. The 150, with some variance, seems to be around the limit for the number of people we can keep track of, reasonably call part of our social network, and maintain as a cohesive group. This may be partly due to the limits of our memories and the effort it takes to maintain relationships. There are many instances of the ~150 in action, for example, in challenges of transitioning companies as you exceed 150 employees while maintaining cohesiveness, the size of Neolithic farming communities and the basic unit size of Roman armies. The number is actually 148, but 150 is catchier and seems fine between friends.The evolutionary psychologist Robin Dunbar identified that an average person’s social network appears to follow simple scaling laws. Our networks grow from our closest friends—whom we would seek personal advice or help from in times of severe emotional and financial distress—through our superfamily (or close friends), to our acquaintances (or clan), whom we might invite to a party, and to our most casual friends (or tribe). At each level, the number of people typically increases by about a factor of 3. So you might have 5 close friends, 15 in your superfamily, about 50 in your clan and about 150 in your tribe. The 150, with some variance, seems to be around the limit for the number of people we can keep track of, reasonably call part of our social network, and maintain as a cohesive group. This may be partly due to the limits of our memories and the effort it takes to maintain relationships. There are many instances of the ~150 in action, for example, in challenges of transitioning companies as you exceed 150 employees while maintaining cohesiveness, the size of Neolithic farming communities and the basic unit size of Roman armies. The number is actually 148, but 150 is catchier and seems fine between friends.

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