New Natural Law (NNL) theory or New Classical Natural Law theory is an approach to natural law ethics and jurisprudence based on a reinterpretation of the writings of Thomas Aquinas. [1] The approach began in the 1960s with the work of Germain Grisez and has since been developed by John Finnis, Joseph Boyle, Olaf Tollefsen, Christopher Tollefsen and others. [2] [3] [4] [5] [6] [7] [8] [9] NNL theory typically relies on a concept of 'basic goods'.