Many sourcing clients tell Forrester they see the benefits of systematic multisourcing but have trouble proving them to their stakeholders. Forrester believes that multisourcing's benefits accrue from using a service delivery model grounded in the process and control of the service interface that connects IT demand to IT supply — ensuring cost savings, quality improvements, and innovation flow to line-of-business stakeholders. Moreover, governance mechanisms provide structure and deal controls to drive inter-provider behavior to satisfy the most skeptical of stakeholders. Start quantifying multisourcing's benefits by working with your stakeholders, establishing a baseline and creating a set of guiding principles that will underpin a move to systematic multisourcing. Smart sourcing executives will be careful to educate constituents on which outsourcing satisfaction problems multisourcing can — and cannot —solve.