New Zealand Police Act
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From the case summary: In order to raise awareness of and increase public participation in the redevelopment of New Zealand’s Police Act 1958, the Police Act review team opened a wiki-based collaborative effort to rewrite the Act. This case met a global audience and drew extensive participation as well as media coverage, and established a strong example of utilizing collaborative technologies in the writing of laws.
Source: https://web.archive.org/web/20191215033334/http://www.participatedb.com/references/57