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--- course_outline [2013/03/20 14:54] – jonathan
+++ course_outline [2013/04/07 15:52] (current) – jonathan
@@ Line 47: / Line 47: @@
 We develop a phone book example by developing a mathematical model from informal E/R-descriptions. We discuss the importance and significance of the relation (and function) override operator. See slides "UsingRelations" in the SVN which includes: relations, relational image, relational inverse, domain and range restrictions and subtractions, and relational composition.
+===== More systems =====
+in the last two weeks of class we studied a train system and an EHealth medication system.
+For the EHealth system the requirements were:
+  *E1: a set of doctors prescribes drugs to a set of patients
+  *E2: there exists pairs of drugs that when taken together have undesirable interactions
+  *E3: Drug interaction is symmetric, i.e. if a drug interacts with another, then the reverse also applies
+  *R1: A doctor shall be capable of adding drugs to a patients’ prescription.
+  *R2: A doctor shall not prescribe two drugs that interact
+  *Goal:  minimize the number of undesirable interactions