What is a Model? Simulation?
•Representation of the relevant features of an actual system.
•Which features are "relevant" and how much detail is incorporated into the model are determined by the purpose for which the model was developed.
•Model types
–Pictorial, Analytic [Mathematical, Symbolic], Physical
–Static v. Dynamic
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•Real-time/Operational Monitoring v. Planning Models
System
Model
e = mc2
In simulation time is the common and principle independent variable
Key work here is SYSTEM. Modeling is about understanding systems - how does this thing work, what are all the components, how do they fit together, what feedback mechanism are in place.

Transportation Centers – FAA, City Subway Systems, Electrical Utilties

NOCs w/ HP Openview, Tivoli, CA Unicenter

Models discussed here today are planning and learning models

Symbolic modeling maybe something like predicate calculus [John ?? At University of Tulsa] or state space/Petri Net [Moitra&Konda at Carnegie Mellon Univ] modeling which utilizes a specific set of symbols to represent ideas about objects, time, sets, and ways to manipulate them