Measurement structures of hope: A review of single-factor and two-factor models across hope scales.

Snyder's theory of hope has been a cornerstone of hope research for over four decades. The original theory conceptualized hope as a two-factor model representing agency and pathways, however, recent studies have suggested a single-factor model may be the best fit for hope instruments. This has become more apparent as hope scales have been translated into different languages, across different cultures, and examining new domains. Currently, single and multiple factor models have been supported for most hope measures but will continue to be examined as we explore what hope means to unresearched populations and with new and varied contexts.