In Athens, every man over the age of 20 had the right to participate in the citizen assembly. Democracy was direct instead of representative, and male citizens had not only the right but the duty to participate in public life. Assembly members were not elected in advanced, everybody was welcome to come to the meetings and express their opinion through voting.
At the beginning, the Assembly was used to name officials, and it had legislative, executive and judicial powers. Trials were some time later transferred to law courts.