This study comprises 4 phases designed to systematically develop and test a reliable, valid
and useful quantitative measure of the components and dimensions of yoga; each phase builds
on the previous phase. Phase I aims to gain a comprehensive understanding of the relevant
aspects of yoga therapy and develop a large pool of potential questionnaire items by
conducting a thorough literature review and focus groups with yoga teachers and students.
These data will be analyzed using rigorous qualitative methods to identify key conceptual
dimensions associated with yoga interventions. Phase II will develop a prototypic
questionnaire to assess yoga therapy by refining and honing information from Phase I and
conducting cognitive interviews to further develop this instrument. Phase III will pilot test
the measure in a field observation of yoga students and use factor analysis and item response
theory to select the best items per dimension and to reduce the number of items in the
measure. Phase IV will collect data on the new instrument and test the psychometric
properties of the questionnaire (i.e., reliability and validity using data collected in
Phases III and IV).