We describe the triangulation of qualitative and quantitative research methods used to develop and test the Adolescent Resilience Model (ARM). The differences in meaning-based and function-based health-related quality of life (HRQL) are discussed, and method triangulation is presented as a means of developing models of HRQL that represent the perspectives of the adolescent and family. Qualitative methods of phenomenology, simultaneous concept analysis, focus groups and thematic analysis were used to generate the ARM. Quantitative instrumentation and structural equation model development and testing were used to evaluate the ARM. A decision-making process for combining qualitative and quantitative research, so that both approaches are equally valued and used, is also presented. Int. J. Cancer Suppl. 12:125–131, 1999. ©1999 Wiley-Liss, Inc.