MSU CMPS 4223 - Validation & Verification (23 pages)

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Validation & Verification



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Validation & Verification

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Pages:
23
School:
Midwestern State University
Course:
Cmps 4223 - Intro To Simulation
Intro To Simulation Documents

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Validation Verification Chapter 10 1 VALIDATION VERIFICATION Very Difficult Very Important Conceptually distinct but performed simultaneously You must be sure your model is correct Your client must be confident that your model is correct Should be an integral part of model building 2 VALIDATION Goals Produce a model that represents system behavior closely enough to be a substitute for the system for experimentation Analyzing predicting performance Increase credibility of model to managers decision makers 3 DEFINITIONS Verification Ensures that the model developed is correctly implemented in the software Validation Ensures that the model accurately represents the realworld system 4 Validation Verification Process An integral part of model design implementation process not separate Most methods are informal or heuristic in nature Experience in model development simulation programming the system are essential 5 MODEL BUILDING 1 Observation of real system 1 Collect data 2 Talk to members of system 2 Construct conceptual model 1 Assumptions about components structure of system 2 Hypothesis values of input parameters 3 Implement operational model 1 Usually using simulation software Not linear process iterative 6 SUGGESTIONS FOR VERIFICATION 1 Operational model checked by simulation software expert not developer 2 Flow diagram for each possible action 3 Examine output for reasonableness under various inputs use wide variety of output statistics 4 Print input at end of run to ensure stability 5 DOCUMENTATION 6 Ensure animation of model is correct 7 SUGGESTIONS FOR VERIFICATION 7 Use debugger of interactive run controller IRC advantages 1 Can monitor simulation progress display results 2 Can focus on single line or process 3 Can observe model components variables 4 Can pause reassign values 8 GUI always recommended Basic Software Engineering Principles 8 Suggestion 3 Examine output for reasonableness Calculate expected results Vary input Ask users to review Examples Suppose



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