No enterprise architecture plan for health information system can make some problems for one hospital or inter-hospital setting and for both patients and doctors. For example, when a patient is referred from a hospital, he needs to take health information with him. If doctors need other information that is not available. That patient needs to go back to the previous hospital to get more information and this may delay treatment. The format of information of each hospital may not be interoperable for doctors to easily understand and this can make duplication of investigation and delay treatment also.