Design patterns, proven technology stacks, and well-documented application infrastructure are fundamental tools for promoting common practices in the design of business solutions. Enterprises often create a library of design patterns covering a range of use cases and common infrastructure components; the complete set of these architecture models forms a prescriptive reference. Forrester's Enterprise Reference Architecture Tool Kit provides a starter kit for understanding these reference architectures, their application, and the processes needed to develop, use, and evolve them over time.