This is a report of the validation process of two scales that measure the OIS-García (optimist interactive style). An attempt was made to establish construct and convergent validity for these two scales. Towards this end, we relied on the Spanish version of the LOT-R (life orientation test-revised). Participants were 350 relatives of a cancer patient with a mean age of 39.87 years (SD = 14.88) and an age range going from 15 to 79 years. Each of the new versions of the OIS1-García and OIS2-García comprised 10 items. The Chronbach alpha internal consistency coefficients were 0.701 for the OIS1 and 0.633 for the OIS2. The Spearman correlation coefficient among these two tests was 0.438, the correlation among LOT-R and OIS1-García was 0.382, and the correlation among LOT-R and OIS2-García was 0.468. As a result, we were able to partially validate both versions of the OIS-García test.These findings serve as encouragement to develop more culturally sensitive and appropriate measurement instruments for specific cultures or populations.