The general concept of "proposal" can refer to several different things:

• A business proposal. See Proposal (business).
• A marriage proposal. See betrothal.
• "An offer he can't refuse". See The Godfather.
• In reference to a capital project (i.e., building, expressway, etc.) in the planning or design phase, envisioned on paper, but yet to be built.

• Proposals is a play by Neil Simon.