Eunomics is a term, first proposed by legal scholar Lon Fuller, to describe "the science, theory or study of good order and workable arrangements".
Relationship with New Institutional Economics
Nobel prize winner Oliver E. Williamson, a leading mind of the New Institutional Economics (NIE) movement, refers to Fuller's definition of eunomics as a simulacrum of his understanding of the term governance. Same as with the NIE, eunomics are foremost concerned with the question how to achieve a desired outcome.
References
Eunomics Wikipedia(Text) CC BY-SA