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These noise models are often just ISO 9613 / CRTN / CRN machines, and unfortunately many users find themselves reliant on the methods in modelling rather than understanding the core concepts operating below the surface. Often simple excel calculations are sufficient to demonstrate a result, and the task doesn't justify building an overly complicated model.
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I think we often forget however that these programs are intended to be tools to assist in our work rather than the basis by which we should work. Checking roof plant in an urban environment or looking at how changes in traffic patterns may affect an existing development, the gut impulse may be too reach for that licence dongle. it's difficult not to turn to them for many situations. Once competent in CadnaA, SoundPlan, LimA, etc. It's a great question that I think many acousticians struggle with, especially early in our careers. Towards the end, it was asked of the panellists "When should we be using acoustic models?" A few years ago I attended an IOA conference, The Art of Being a Consultant, an event that introduced acousticians early in their careers to concepts and strategies employed by some of the industry leaders in consultancy.