Validation - Chapter 10 Verification and Validation of...

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

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