The primary function of a parliamentary system of government is to enable the executive branch to be directly accountable to the legislature. In this system, the head of government, typically a prime minister, is chosen from the elected members of the parliament and relies on its support to govern. This structure promotes greater synergy between the legislative and executive branches, allowing for more cohesive policy-making. Moreover, it often allows for swift legislative action in response to public needs, contrasting with systems where separation between branches can lead to delays or gridlock.