Witam,
Two years ago I created the system for Silesian Center for Hert Disise. The system support the National Heart Transplant Discovery & Analysis program. I spent over 2 month to gather the requirements and design and implement the data model describing personal, treatment, contact, medical examination(EKG, UKG, Spirometry end dozens others) entities. If I had studied the Logical Data Model described in "The Data Model Resource Book: A Library of Universal Data Models by Industry Types, Revised Edition, Volume 2" by Len Silverston (http://library.books24x7.com.ezproxy1.lib.depaul.edu/book/id_11287/viewer.asp?bookid=11287&chunkid=909290277 ) I would save a month for designing such a model from scratches and give more accurate entities fields. I would use generic psychical haracteristic, haracteristic type entities instead fixed characteristic haracteristic in one table.
Cheers,
WM
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