Life Orientation Test (LOT-R)
Life Orientation Test (LOT-R) is a 10 item questionnaire.
Items are scored on a 0-4 scale, with the total scale score calculated as a sum of the factor scores.
Scheier, M. F., Carver, C. S., & Bridges, M. W. (1994). Distinguishing optimism from neuroticism (and trait anxiety, self-mastery, and self-esteem): A re-evaluation of the Life Orientation Test. Journal of Personality and Social Psychology, 67, 1063-1078.
Carver, C. S., Scheier, M. F., & Segerstrom, S. C.(2010). Optimism. Clinical Psychology Review, 30, 879-889.