The purpose of the proposed IEA Task is to coordinate international research activities, towards the analysis of wind power plants as holistic systems. To fully assess how a change, or an uncertainty, in a design parameter affects the myriad of objectives in system performance and cost, a holistic and integrated approach is needed. Integrated systems research, design and development (RD&D) can provide opportunities for improvements in overall system performance, and reduction in the levelized cost of energy. However, there are significant challenges to developing such integrated approaches, both within and across organizations. There is a need to explore both the opportunities and the challenges for applying systems engineering to integrated wind energy RD&D across the entire wind energy system. This need surfaces both in the tools and methods used in wind plant RD&D.