Special Interest Group
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A Special Interest Group (SIG) is a community with an interest in advancing a specific area of knowledge, learning or technology where members cooperate to affect or to produce solutions within their particular field, and may communicate, meet, and organize conferences. They may at times also advocate or lobby on a particular issue or on a range of issues but are generally distinct from Advocacy groups and pressure groups which are normally set up for the specific political aim; the distinction is not firm however and some organizations can adapt and change their focus over time.
Technical SIGs 
Non-technical SIGs 
Organizations which are not technical may also have Special Interest Groups which are normally focused on a mutual interest or shared characteristic of a subset of members of the organization. An important example for this are trade unions. For identity-based advocacy groups, see identity politics. JALT, the Japan Association for Language Teaching, has several SIGs. Together they organize a Pan-SIG conference each year.
See also 
- "SIGMAA: Special Interest Groups of the MAA". Mathematical Association of America. 2008-08-22. Retrieved 2009-01-19.
- The Community Discovered Special Interest Groups, groups for specific interests within an educational organization.
- Friends General Conference Summer Gathering Adult Young Friends Program, a young adult-focused SIG in a Quaker organization.