The Nigerian legislature has 3 functions:
Lawmaking: The NASS makes laws for the peace order and good governance of the federation (section 4 of the Constitution)
Oversight: NASS has extensive oversight powers. These include control over the spending of federal funds, the national budget, the authority to provide advice and consent for appointments to key executive positions, the power to approve and scrutinize bills including the power to impeach the President and his deputy.
Representation: As part of their representative responsibilities, members of the NASS routinely identify and direct the attention of the executive arm of government to the peculiar needs in their various constituencies.