In groups of three - one student from the home, school and play groups - students complete each other's questionnaires.
The researchers determined that kids who attend day care and play groups decrease their risk of developing the most common type of childhood leukemia by 30 percent.
The investigation also uncovered so called "age play" groups that revolve around the abuse of virtual children.
Student-founded alumni groups play a very important role in recruiting students to attend their alma maters.
Even some legitimate groups play loose with the truth in order to garner publicity and money.
Holland America still scores points for encouraging toddlers and parents to play together in groups at scheduled times.
Citizens' groups play roles that go far beyond political activism.
To better understand the role violent grassroots groups play in Latin American politics, it is instructive to look to Karl Marx's study of Louis Napoleon's 1851 coup d'etat in Paris.
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Last year, Gaynor Sbuttoni, who provides counselling for children in London, said it was increasingly common for teachers to encourage pupils to play in large groups instead of developing tight-knit bonds.
Most are no longer the population centres of their communities, and many now play host to other groups.
He said the plan was called Everybody's Business as local people, businesses and community groups all play a part.
While neither faction espouses militancy, there are signs that radical groups could play one camp off against the other for their own benefit.
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They do, however, allow committed groups to play by new rules.
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Although Ojkanje is traditionally passed on orally, audio and video media and organized training within local folklore groups now play an increasing part in its transmission.
He said a rural policing strategy was needed within financial challenges and suggested special constables could be deployed to rural areas while neighbourhood groups would play an important role.
"Groups would play for an hour without pausing, not to be mobbed or screamed at but in hopes of an ovation, " critic Nik Cohn wrote about musicians in the caption.
In general, advocacy groups do not play the same role in bringing people into politics as the old federations did.
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You can't make a blatant play for special-interest groups (and that includes women) and wind up with a united country, even if you win.
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Promotion from the Championship would be determined via end-of-season play-offs involving two groups of four teams, drawn from the top eight in the league, culminating in a single winner, who would go up to the Premiership.
Facebook, now the world's largest social-networking site, allows over 300m users to chat, send messages, post comments, share links, photos and videos, play games, and form groups around shared interests or projects most of the things that collaboration tools are expected to be able to do, in short.
The same threat was made to conservative groups that might dare play in the election.
Opposition groups also had to play their part, renouncing violence and accepting the results of elections, she said.
The agencies cited the crucial role the studies play in drug development and urged groups to work together.
But would you actually spend the time to play the predictions game with larger groups on your phone?
Besides Arafat, the other important absence from the summit was that of the Palestinian militant groups, who will play a key role in determining whether the summit's grand promises are kept.
He also told a regular weekly meeting of key cabinet ministers that humanity had "grown up" and terrorist groups could no longer play one world power off against another, Interfax news agency reported.
He reminisces about how all the pop groups back in the day would play short riffs to one another and exchange ideas.
He also said the media were to blame for ignoring climate change, although he said green groups also had a role to play in keeping that issue in the public eye.
The First Minister said that they are concentrating on the 3 - 7 age groups with schemes of learning through play as it is the best way to retain a child's confidence.
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