No voter can prove that they voted in a particular way. This property is important for the prevention of vote buying and extortion. Voters can only sell their votes if they are able to prove to the buyer that they actually voted a certain way. A voter can change their vote within a given period of time. This is typically not allowed in civic elections.
Flexibility is important for write-in candidates and some survey questions.
No restrictions, other than logistical, on the location from which a voter can cast a vote. The election can be administered with a reasonable amount of resources. Since the early 1980 s, considerable work has been done to develop secure and efficient Internet voting methods. However, most Internet voting systems do not leverage this prior work. Ballot box stuffing is tolerated, the voter's privacy is not maintained, and vote tampering is not prevented.