You are to design a prototype for a hospital management system.
Patients are treated in a single ward by the doctors assigned to them. Usually each patient will be assigned a single doctor, but in rare cases they will have two. 

Heathcare assistants also attend to the patients, a number of these are associated with each ward. 

Initially the system will be concerned solely with drug treatment. Each patient is required to take a variety of drugs a certain number of times per day and for varying lengths of time. 

The system must record details concerning patient treatment and staff payment. Some staff are paid part time and doctors and care assistants work varying amounts of overtime at varying rates (subject to grade). 

The system will also need to track what treatments are required for which patients and when and it should be capable of calculating the cost of treatment per week for each patient (though it is currently unclear to what use this information will be put). 

1. Design a data model for this system
2. Convert the data model to a set of virtual windows
3. Apply appropriate Gestalts to the prototype to structure the information