The role of the Central Committee has varied throughout history. While it generally exercises power through formal procedures defined in the party constitution, the ability for it to affect outcomes of national-level personnel decisions is limited, as that function has generally been, in practice, carried out by the Politburo and retired party elders who retain influence. Nonetheless, Central Committee plenums function as venues whereby policy is discussed, fine-tuned, and publicly released in the form of "resolutions" or "decisions".