The go-to resource for assessing and predicting functional abilities in persons with brain injury or cognitive decline has now been revised and expanded to reflect major advances in the field. With a focus on key real-world capacities--independent living, vocational functioning, medication management, and driving--leading experts explore how individuals go about their daily lives, what disruptions occur, and opportunities for improving function. Strategies for direct assessment are reviewed, from standard neuropsychological tests to multimodal approaches and technology-based tools. Chapters also provide functional assessment guidance for specific neurological and psychiatric conditions.