Decoherence does not resolve the measurement problem in quantum mechanics, as it results in an improper mixed state rather than a proper one, which is necessary for a true solution. The distinction between proper and improper mixed states cannot be experimentally determined when only subsystem observables are measured. Observations with sufficient specificity are required to identify decoherence, but this does not imply a collapse of the quantum state. The discussion highlights that decoherence merely explains an apparent collapse, while the system remains in superposition. Ongoing research continues to explore the implications of decoherence, particularly in relation to interpretations like many-worlds.