Preferential Ballot in Papau New Guinea

A switch from first past the post to preferential ballot decreased violence and encourage inter-tribal cooperation:

http://www.crawford.anu.edu.au/pdf/staff/ben_reilly/Ethnic%20Conflict%20...
http://www.crawford.anu.edu.au/pdf/staff/ben_reilly/political_reform_png...

more essays..

http://www.crawford.anu.edu.au/staff/breilly.php