A Scheme

1. A systematic plan of future action.
2. A plot or secret, devious plan.
3. An orderly combination of related parts.
4. A chart or diagram of a system or object.
5. (mathematics) A type of topological space.
6. (Britain, chiefly Scotland) A council housing estate.
7. (rhetoric) An artful deviation from the ordinary arrangement of words.
8. (astrology) A representation of the aspects of the celestial bodies for any moment or at a given event.
9. (Internet) Part of a uniform resource identifier indicating the protocol or other purpose,
10. (Britain, pensions) A portfolio of pension plans with related benefits comprising multiple independent members.

In the US, generally has devious connotations, while in the UK, frequently used as a neutral term for projects: “The road is closed due to a pavement-widening scheme.”

(a systematic plan of future action): blueprint