This thesis presents a new process for designing eco-industrial parks (i.e., EIPs) that identifies the decisions that need to be made during each phase. A literature review about the different EIP development processes in the U.S. and worldwide is conducted to create a general EIP development process. A careful analysis of 21 EIP development processes was conducted to illuminate the different routines associated with each step in these processes. This thesis presents a revised EIP development process that follows the decision-based design principle of aligning all decisions with the involved organizations' most important objectives.