A Green Paper is a preliminary report of government proposals published to provoke discussion and seek feedback. It serves as a consultation document. A White Paper is a more authoritative report that outlines the government's policy intentions and sets out proposals for future legislation. It is typically issued after the consultation phase reflected in a Green Paper. 

Key Point: This question clarifies the difference between Green Papers and White Papers in the legislative process, emphasizing their respective roles in policy formulation and consultation.