Five companies account for nearly half of the market for each category, although they tend differ for the various groups, Lannes said.

兰尼斯表示，在每个细分类别的市场，都有五家公司占据了将近半壁江山。

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The Educational category groups the educational and pedagogic characteristics of the learning object.

教育（Educational）范畴包括学习对象的教育性和教育学特征。

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3 users from each category if testing three or more groups of users (you always want at least 3 users to ensure that you have covered the diversity of behavior within the group).

2、如果测试3个或更多的用户群，则每类有3个测试用户就可以了(至少3个users就可以确保你覆盖到某一个用户群中的不同的行为)。

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People, if they can use can a product of any category, photos, groups, music, TV, anything, either by themselves or with their friends, I think most of the time they want to do that with their friends.

FORBES: Facebook, cartoons, pedophiles and a friend-sourced future

It could take five years to reach the miscellaneous category and then another few years to get into one of the club's seven groups most likely as a "sporting dog, " a variety that includes cocker spaniels and golden retrievers.

WSJ: Breeders of Rare Woolly Pooch