![]() It is concluded that while all types of research validities are important to be considered, maximizing all of them in one research project is sometimes controversial. Furthermore, the matter of priority between these research validities is discussed. A classification of all types of validity in rehabilitation research is presented in this chapter. Moreover, the main threats to each type of validity and some strategies to minimize them are discussed. Different classifications of validity in the literature were recognized, considered, unified, and are presented in this chapter. A basic review of the body of literature available was conducted. The aim of this chapter is to provide an all‐inclusive classification of different types of research validity, focusing on rehabilitation research. Classification of research validity has been considered and developed over the past six decades however, a literature search returned no comprehensive discussion that has gathered all available classifications under an overarching umbrella. With regard to rehabilitation research, however, this body is narrow and warrants further consideration. There is a considerable body of literature on research validity across different disciplines.
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