a systematic plan or programme for a course of action or for putting an idea, project, etc into practice
a systematic arrangement of parts or elements; a design
an organized system of financial investment, insurance, etc
a pension scheme
a secret plan, esp one that involves something illegal or, dishonest, or wrong
chiefly Scot a housing estate run by a local authority
[from Latin schema a figure of speech or a representation, orig of the position of the celestial bodies, from Greek skhēma form, figure]