Abstract: A system operable to transmit healthcare data to a user device configured for use in analysing medical information. A directed graph representing at least one medical guideline is maintained in a database. The directed graph includes a plurality of nodes connected by a plurality of directed edges. In some examples a directed graph is selected based on a medical condition and a context parameter. In some examples a directed graph is generated based on differences between versions of medical guidelines. A patient model may be maintained in a database and in some examples based on a combination of the directed graph and the patient model, further healthcare data is transmitted to the user device. The status of nodes and edges may be determined based on a combination of a directed graph and a patient model.