We present an application of the Scanlan Collaborative Interview Method (SCIM) to the Project on Elite Athlete Commitment (PEAK). PEAK examines three samples of elite international athletes to further test and expand the Sport Commitment Model and assess its external validity. This first article in the series provides detailed descriptions of the study rationale, methods, procedures, interview schedule, and analysis strategy common to the three samples, along with participant characteristics and selection criteria. It also shares participants’ observations of the centrality of commitment to their athletic success, and their evaluation of the interview process.