The paper by Maximilian Schlosshauer explores the implications of decoherence for the foundational problems of quantum mechanics, particularly the measurement problem. Decoherence, which refers to the suppression of interference between different states of a system due to its interaction with an environment, has been proposed as a solution to the measurement problem. The author reviews the key features of the decoherence program, including its recent developments, and examines how these can be applied to various interpretive approaches of quantum mechanics. The measurement problem, central to quantum mechanics, involves reconciling the quantum superposition principle with the classical world we observe. This problem is exemplified by the von Neumann measurement scheme, where a microscopic system interacts with a macroscopic apparatus, leading to a non-classical state that does not correspond to our everyday experience. The measurement problem includes two main components: the problem of definite outcomes and the problem of the preferred basis. Decoherence is argued to address these issues by explaining how the environment's interaction with a quantum system leads to the suppression of interference, effectively "classifying" the system's states into a set of robust, macroscopically distinguishable "pointer states." This process is often referred to as environment-induced decoherence and superselection. However, the author notes that while decoherence has made significant progress, it does not fully resolve the measurement problem. The paper discusses the limitations of decoherence in providing a consistent and non-circular solution to foundational questions, emphasizing the need for further investigation and interpretation within different quantum mechanical interpretations. The paper also delves into the concept of reduced density matrices, which are crucial in the decoherence program, and a modified von Neumann measurement scheme that includes the environment. It concludes by highlighting the ongoing debate and the need for a balanced discussion of decoherence's role in addressing the measurement problem.The paper by Maximilian Schlosshauer explores the implications of decoherence for the foundational problems of quantum mechanics, particularly the measurement problem. Decoherence, which refers to the suppression of interference between different states of a system due to its interaction with an environment, has been proposed as a solution to the measurement problem. The author reviews the key features of the decoherence program, including its recent developments, and examines how these can be applied to various interpretive approaches of quantum mechanics. The measurement problem, central to quantum mechanics, involves reconciling the quantum superposition principle with the classical world we observe. This problem is exemplified by the von Neumann measurement scheme, where a microscopic system interacts with a macroscopic apparatus, leading to a non-classical state that does not correspond to our everyday experience. The measurement problem includes two main components: the problem of definite outcomes and the problem of the preferred basis. Decoherence is argued to address these issues by explaining how the environment's interaction with a quantum system leads to the suppression of interference, effectively "classifying" the system's states into a set of robust, macroscopically distinguishable "pointer states." This process is often referred to as environment-induced decoherence and superselection. However, the author notes that while decoherence has made significant progress, it does not fully resolve the measurement problem. The paper discusses the limitations of decoherence in providing a consistent and non-circular solution to foundational questions, emphasizing the need for further investigation and interpretation within different quantum mechanical interpretations. The paper also delves into the concept of reduced density matrices, which are crucial in the decoherence program, and a modified von Neumann measurement scheme that includes the environment. It concludes by highlighting the ongoing debate and the need for a balanced discussion of decoherence's role in addressing the measurement problem.