Researchers employing observational studies need to develop a coding scheme that is robust enough to measure behaviors of interest adequately. However, the more intricate the coding scheme, the more difficult it is for observers to code correctly and consistently. The purpose of this article is to describe the use of a simulation suite in a multimodal training approach to accommodate a complex coding structure and achieve observer agreement. The observer training included explanation of codes and technology, coding of simulation video, and observer-trainer hospital practice. The simulation video consisted of hypothetical nurse-patient scenarios filmed in a simulation suite that mimicked the hospital setting. Researchers should consider using simulation suites in their training programs to achieve observer agreement in observational studies of complex behaviors in the ever-changing clinical environment.