The power to initiate or prepare legislation under section 55(1)(b) vests not only in the National Assembly as a collective but also in individual members. Section 73(2) confers on individual members the power to introduce Bills in the Assembly. The Assembly's rule-making power under section 57 is limited to procedural regulations and does not permit substantive limitations on members' constitutional powers. Rules that impose a "permission" requirement preventing individual members from exercising their powers to initiate, prepare, or introduce legislation are unconstitutional to the extent of that inconsistency. The values of representative and participatory democracy, transparency, accountability, and openness require that individual members, including those from minority parties, have genuine opportunities to exercise their legislative powers.