+A Power Index quantifies the influence of a [voter](/wiki/voter) or player within a [coalition](/wiki/coalition) or voting body. It reveals the distribution of decision-making ability, especially when votes are weighted or structured unevenly.
+## See also
+- [Voting System](/wiki/voting_system)
+- [Game Theory](/wiki/game_theory)
+- [Weighted Voting](/wiki/weighted_voting)