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Passing Data Between Tiers in 3-Tier Architecture

Assuming we are talking physical tiers, my understanding is that in order to pass data from say the data tier to the business logic tier the JSON format is used (or XML), so say I have an ORM ...
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Layer Encapsulation without Model Overload?

I'm starting a new project, so it's time to re-evaluate how I do things. In the recent past I have created a 3 layer/tier project (UI, Domain, Data) with each tier with it's own separate model. The ...