It is common to see different research finding about the same psychological construct. The same is true in attitude towards HIV/AIDS. It is agreed that such finding differences are results of differences in demographic characteristics of participants in studies. As the quality of scales influence research findings and findings in turn influence practices, researchers should develop and validate their own attitude scale for each community they are interested to study its attitude. Therefore, this book, which contains important topics to guide your attitude scale development and validation process, illustrates the development and validation process of an HIV/AIDS attitude scale for university students. The development process starts from identifying predictors of students' attitude towards HIV/AIDS and items were prepared under the predictors. Principal component analysis and the integration of convergent and discriminant validity of the scale with its reliability were used to confirm the scale's construct validity.