Developmental psychopathology is an interdisciplinary field that emphasizes the diversity of processes and outcomes in human development. The concepts of equifinality and multifinality are central to this perspective. Equifinality refers to the idea that multiple pathways can lead to the same outcome, while multifinality suggests that different initial conditions can lead to different outcomes. These concepts are derived from general systems theory and highlight the complexity of developmental processes. The article discusses how developmental psychopathologists view the development of disorders and maladaptive behaviors as influenced by various factors, with multiple pathways leading to similar outcomes. It also emphasizes the importance of considering individual differences in the development of disorders and maladaptive behaviors. The Special Issue presented in the article includes a variety of studies examining developmental pathways, focusing on longitudinal data and diverse populations. The studies explore various psychopathological outcomes and the interplay of psychological and biological processes in development. The authors argue that a pathways approach is essential for understanding the complexity of development and the diversity of individual experiences. The article also highlights the importance of considering subgroup analyses to understand the diversity in processes and outcomes. It emphasizes the need to examine the totality of attributes, psychopathological conditions, and risk and protective processes in the context of each other rather than in isolation. This approach provides a more comprehensive understanding of development and the factors that contribute to individual differences. The authors conclude that the concepts of equifinality and multifinality are crucial for understanding the complexity of development and the diversity of individual experiences. They encourage researchers to move beyond post hoc discussions of their findings and to focus on demonstrating the multiplicity of processes and outcomes that may be articulated at the individual level. Ultimately, future research should be designed with these differential pathways concepts as a foundation to achieve the unique goals of developmental psychopathology.Developmental psychopathology is an interdisciplinary field that emphasizes the diversity of processes and outcomes in human development. The concepts of equifinality and multifinality are central to this perspective. Equifinality refers to the idea that multiple pathways can lead to the same outcome, while multifinality suggests that different initial conditions can lead to different outcomes. These concepts are derived from general systems theory and highlight the complexity of developmental processes. The article discusses how developmental psychopathologists view the development of disorders and maladaptive behaviors as influenced by various factors, with multiple pathways leading to similar outcomes. It also emphasizes the importance of considering individual differences in the development of disorders and maladaptive behaviors. The Special Issue presented in the article includes a variety of studies examining developmental pathways, focusing on longitudinal data and diverse populations. The studies explore various psychopathological outcomes and the interplay of psychological and biological processes in development. The authors argue that a pathways approach is essential for understanding the complexity of development and the diversity of individual experiences. The article also highlights the importance of considering subgroup analyses to understand the diversity in processes and outcomes. It emphasizes the need to examine the totality of attributes, psychopathological conditions, and risk and protective processes in the context of each other rather than in isolation. This approach provides a more comprehensive understanding of development and the factors that contribute to individual differences. The authors conclude that the concepts of equifinality and multifinality are crucial for understanding the complexity of development and the diversity of individual experiences. They encourage researchers to move beyond post hoc discussions of their findings and to focus on demonstrating the multiplicity of processes and outcomes that may be articulated at the individual level. Ultimately, future research should be designed with these differential pathways concepts as a foundation to achieve the unique goals of developmental psychopathology.