Does "working group" mean "research group"?

Context:

A better climate

The Intergovernmental Panel on Climate Change will complete its fifth assessment report by November. The findings of working groups II and III will focus on the impacts of climate change, and on how societies can adapt to or mitigate those effects (working group I published its findings last year). Away from formal negotiations, United Nations secretary-general Ban Ki-moon is hoping for “bold pledges” on emissions at a summit in New York in September. In research, a large carbon capture and storage project in Canada — the Can$1.24-billion (US$1.17-billion) Boundary Dam coal power-plant in Saskatchewan — begins commercial operation in April.

More:
http://www.nature.com/news/what-to-expect-in-2014-1.14448