scheme theory

Short definition from Wiktionary

Noun

1. 1
   Used other than figuratively or idiomatically: see scheme, theory.
2. 2
   The branch of mathematics that concerns schemes (locally ringed spaces admitting coverings by open sets, each isomorphic to the spectrum of some commutative ring).
3. 3
   A theory of group decision-making which explains group decisions as the result of a decision scheme on the initial distribution of attitudes in the group.