Officials are volunteers elected to committees controlling these groups by sortition.
From the en.wikipedia.org
It is a form of sortition which inherently has only two possible and equally likely outcomes.
From the en.wikipedia.org
They used a method of sortition to draw candidates for public office.
From the en.wikipedia.org
Regrettably, many people don't even know what sortition is.
From the guardian.co.uk
In the political domain, sometimes sortition is held as an example of what wisdom of the crowd would look like.
From the en.wikipedia.org
In the sortition for provinciae, the two Spains were to be left out in odd-numbered years, and only four praetorships would be available in those years.
From the en.wikipedia.org
Each tribe's delegation would be an executive of the boule for one-tenth of the year, so that ten groups of prytaneis served each year, a position granted by sortition.
From the en.wikipedia.org
This is confirmed by the historical resort to having decisions made by officials selected at random, perhaps with a complex process of intermediate qualifying steps, called sortition.
From the en.wikipedia.org
As the Elections were considered an oligarchic institution and most political offices were filled using sortition, also known as allotment, by which officeholders were chosen by lot.
From the en.wikipedia.org
More examples
Casting lots: making a chance decision by using lots (straws or pebbles etc.) that are thrown or drawn
Sortition, also known as allotment or drawing lots, is an equal-chance method of selection by some form of lottery, and most commonly refers to selecting decision makers as a random sample from a larger preselected pool of candidates. ...