The objective of this study was to provide initial validity evidence for responses to the newly expanded version of the I COPPE Actions scale from adults with obesity under an exploratory latent variable approach. Longitudinal data from the 2018 Fun For Wellness Effectiveness Trial (ClinicalTrials.gov, identifier: NCT03194854) were reanalyzed in the current study. The a priori measurement theory specified a six-dimensional correlated structure of well-being actions to govern responses to the I COPPE Actions scale: "I"nterpersonal, "O"ccupational, "C"ommunity, "P"hysical, "P"sychological, and "E"conomic. The a priori measurement model exhibited exact fit to well-being actions data at baseline within an exploratory latent variable approach. There was strong evidence for at least partial measurement invariance by time for responses to the scale. Convergent (or divergent) correlations between concordant (or discordant) pairs of well-being actions self-efficacy scores and latent well-being action factors provided strong evidence for hypothesized relationships to other theoretically relevant variables.