The present invention relates to a method for optimisation of the sustainability footprint of a polymer formulation, wherein the method involves: a. identifying one or more material specifications which are to be present in the polymer formulation; b. identifying one of more sustainability criteria to be optimised in the polymer formulation; c. providing a repository of materials that may be selected for use in the polymer formulation; d. providing a computer-implemented algorithm for calculating the contribution of each of the materials selected from the repository to achieving the desired material specifications of the polymer formulation; e. providing a computer-implemented algorithm for calculating the contribution of each of the materials selected from the repository to optimising the desired sustainability criteria of the polymer formulation; and f. calculating the composition of the polymer formulation wherein the polymer formulation demonstrates the optimal values for the sustainability criteria whilst meeting the material specifications.