Verifying and validating
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Verification is about building something correctly. Verification process determines if you are building the product in the correct way as described in procedure manuals and all quality assurance and quality control activities are being performed as they are supposed to be.
Verification and validation are two important aspects of model building.
Verification and validation compare models with observations and descriptions of the problem modelled, which may include other models that have been verified and validated to some level.
The first step to understand these two different processes is to understand what a model is.
A model, whether it is a mathematical, simulation or physical model is a representation of a real-world process.