This notice of funding opportunity (NOFO) seeks applications proposing a set of planning activities that will lay the groundwork for a scientific project aimed at integrating complementary theories and methods to 1) develop, validate, and apply cutting-edge tools and methods for minimally invasive, multi-dimensional, high-resolution measurement of behavior at the level of the organism, with synchronous capture of changes in the organism’s social or physical environment; and 2) develop data science and computational methods that allow for integration of multidimensional behavioral and environmental data representing multiple timescales, and that will establish of a conceptual and/or computational model of behavior as a complex dynamic system. Prospective projects are expected to be designed with the potential to integrate synchronously recorded neural data and/or inform existing models of neurobehavioral function, such as those developed with the support of the NIH BRAIN Initiative. The purpose of this R34 planning grant opportunity is to support planning and development of the research framework, design, and approach, including activities that will establish feasibility, validity, and/or other technically qualifying results that, if successful, would support a competitive application for a U01, or equivalent, NIH research award.