The relevance of Open Educational Resources (OER) in the Latin American university context requires an instrument that measures the conceptual, procedural, and attitudinal aspects that teachers consider having in their open educational practices. The purpose of this research is to describe the process of design and validation of the Attitudinal Scale of Open Educational Practices (ASOEP) Scale. Consequently, the methodological approach corresponds to a descriptive, transectional, instrumental design that has three components: scale design, evaluation by expert judgment and validation with the pilot application. The pilot test was applied to a random sample with 123 teachers at a university in Colombia. The results from the validation of the content had the participation of five international experts who were classified according to coefficient K in the range between (k: .80 and k: 1.00). From the pilot application, the ASOEP Scale presented a general reliability of ([alpha]: 0.943).