In addition to fostering lively theoretical debates, research on opportunity identification continues to face thorny methodological challenges. Amongst the most salient is the difficulty to estimate theoretically-relevant differences between opportunity ideas early on, before entrepreneurs’ efforts provide evidence that an opportunity idea is worthwhile or not. Addressing this puzzle remains an important step for advancing scholarly understanding of the motivational dynamics by which, in the very early stages of entrepreneurial pursuits, some individuals get sufficiently excited by the prospects of some ideas to examine them further and continue their entrepreneurial efforts. To help foster research in this area, we revisit prior measures and develop a new and augmented set of items. We then conduct a series of studies to validate these items’ effectiveness in capturing meaningful differences between early-stage assessment beliefs of different opportunity ideas.