“Obviously the NASA space program could use a meta data repository to provide that semantic layer between its systems and engineers.” This is a curious supposition. The second I saw was in David Marco’s 2000 Building and Managing the Metadata Repository. That reference was only the first of three similarly dubious claims. Particularly demanded a more rigorous approach to data management than had been needed by prior missions, but that does not seem likely. Perhaps there was something about the Mars Orbiter that Missions, including moon missions and the interplanetary Voyager, that went just fine without (as far as I am aware) the assistance of ORM. This seemed a bit odd to me, since NASA had previously launched hundreds of successful The clear implication was that lack of data semantic modeling, in particular, ORM, caused the disaster. Data by itself is not enough-what we really need is information, the meaning or semantics behind the data.” customary system of measurement to metric units. Used the Mars disaster to support the use of Object Role Modeling (ORM), the topic of his book, noting: “Embarrassingly, the likely cause of this demise was the failure to make a simpleĬonversion from the U.S. Terry Halpin’s excellent 1999 Information Modeling and Relational Databases: From Conceptual Analysis to Logical Design. The first time I encountered such a reference was in Dr. Promote their particular, but different, techniques. It is interesting that this case has been coincidentally selected by three data management professionals to It occurred when firing durations for a guidance jet were mis-communicated betweenĮngineering teams, one of which assumed English units and the other assumed metric units. The disastrous accident of the 1999 Mars Climate Orbiter quickly became part of the lore of technology failures.
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