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Validation - Chapter 10 Verification and Validation of...

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1 Chapter 10 Verification and Validation of Simulation Models Banks, Carson, Nelson & Nicol Discrete-Event System Simulation 2 Purpose & Overview square6 The goal of the validation process is: box2 To produce a model that represents true behavior closely enough for decision-making purposes box2 To increase the model’s credibility to an acceptable level square6 Validation is an integral part of model development box2 Verification – building the model correctly (correctly implemented with the software) box2 Validation – building the correct model (an accurate representation of the real system)
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2 3 Modeling-Building, Verification & Validation 4 Verification - Debugging square6 Purpose: ensure the conceptual model is reflected accurately in the computerized representation. square6 Many common-sense suggestions, for example: box2 Have someone else check the model. box2 Make a flow diagram that includes each logically possible action a system can take when an event occurs. box2 Closely examine the model output for reasonableness under a variety of input parameter settings. (Often overlooked!) box2 Print the input parameters at the end of the simulation, make sure they have not been changed inadvertently.
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3 5 Other Important Tools [Verification] square6 Documentation box2 A means of clarifying the logic of a model and verifying its completeness square6 Use of a trace box2 A detailed printout of the state of the simulation model over time. square6 Animation 6 Calibration and Validation square6 Validation: the overall process of comparing the model and its behavior to the real system. square6 Calibration: the iterative process of comparing the model to the real system and making adjustments.
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4 7 Calibration and Validation square6 No model is ever a perfect representation of the system box2 The modeler must weigh the possible, but not guaranteed,
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