Stroke is one of the most common causes of death, and a major contributor to serious, long-lasting handicaps. It is therefore of high importance to both prevent strokes from happening, and to treat and rehabilitate patients optimally, when a stroke has occurred. A complicating factor is that all phases of this journey involve different actors, data, and patho-physiological processes, which are currently not integrated with each other. We have in previous projects developed a world-unique technology, which could fundamentally change this situation: physiologically based digital twins. What makes our digital twins unique is that they describe physiological processes in all relevant organs, including their cross-talk, and including a connection to statistical machine-learning models. However, these digital twins have not yet been tested and implemented in stroke prevention and care. The objective of this project is therefore to make use of digital twins and AI, to aid in both prevention, acute treatment, and rehabilitation of stroke patients. The goal is that this AI-approach should lead to continuous stratification (hence the name: STRATIF-AI), meaning that any time new data about the patient is produced, these data update the patient's digital twin, which then leads to an update of the patient's diagnosis and treatment assessments. This is obtained by having all data about a patient be copied to that patients Personal Data Vault, which together with the twin and a visualization engine makes out the back-end of our new platform. This backend is then communicating with a series of different eHealth applications, which are used both by patients and their caregivers. In this project, we will both develop these twin models, the technology, and test it in practice, in two different clinical studies: one larger study on prevention (N=300), and a pilot study for rehabilitation. The potential of this project is to lay the basis for a new expandable healthcare system, which supports P4-medicine: Preventive, Predictive, Participatory, and Personalized medicine.