Domain Logic: Where does it go?

I'd argue most software and domain logic is written using Transaction Scripts. Transaction Scripts are single procedures that handle a request. While this can work fairly well in a lot of cases, it starts falling apart when you have a lot of domain complexity and/or a lot of various concerns. A sign you've gone too far is difficulty testing and wanting to call a transaction script from another transaction script. When this happens, what's a solution? Encapsulating your domain logic and state changes within a Domain Model.

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0:00 Intro
1:46 Transaction Script
3:31 Added Complexity
5:32 Heuristics
6:46 Domain Model

#softwaredesign #softwarearchitecture #domainmodel