All diversity, or what? Katharina Walgenbach provides clarity in the confusion of terms. Heterogeneity, intersectionality, and diversity are important trending topics in educational science. Today, it is essential for both study and practice to understand these educational concepts and to use the terms correctly. What are the characteristics of these educational concepts, how do they differ, and what assumptions do they stem from? Katharina Walgenbach clarifies the confusion of terms and ensures their correct application in study and educational practice. The educational concepts come from different sub-disciplines: heterogeneity is primarily discussed in school and intercultural education, intersectionality in gender education, and diversity particularly in social and intercultural education. Walgenbach explains.