Estonian electoral system seems to be very stable when looking at the volatility of parliamentary elections. However, the individual voting behaviour indicates a different situation. The process behind the discrete vote in the parliamentary elections is far more complicated because voters differ in the level of political availability. Some voters are strong supporters of one specific political party and other parties probably do not have a chance to change their preferences. Other voters are more flexible in that matter and they are open to giving their vote to different parties at different elections. The latter is the main focus group for electoral competition because there is indeed a higher probability that they would change their voting preference.
* Peer-reviewed article.