The former president of Kiribati, Ieremia Tabai, is to lead a Commonwealth Expert Group to examine the electoral process in Papua New Guinea.
The PNG government sought Commonwealth help after what some observers described as one of the most chaotic votes ever held in the country.
The election was marred by violence, theft of ballot boxes, voter intimidation, multiple voting by ghost electors and badly prepared electoral rolls.
Voting in six electorates in Southern Highlands province had to be abandoned and has been deferred until January next year.
The Commonwealth group also includes former or current senior election officials from Australia, Canada, Grenada and India.