There will be redundant and complicated information at a higher level if there is no enterprise architecture plan for an overall health information system. Firstly, the operational level need to input the information several times to different program depends on the program manager. Secondly, the higher level who collect the data might struggle with channel receiving the information and might lost the data. Furthermore, the policymaker level would face with unreliable information because of the operational level and the intermediate level could not enter and consolidate data consistently and continuously. Finally, the overall system could not be evaluated thoroughly thus it cannot be improved effectively.