> [!tldr] Systems may be natural. Architectures are designed. I've had a very heavily overlapped mental [[Venn Diagram]] of "Systems Modeling" and "Architecture Modeling" in my head for years. Finally a conversation with [[Large Language Models|ChatGPT]] helped articulate the difference I couldn't quite put my finger on. First - they **are** hugely overlapped. The techniques (*especially* modeling techniques) that apply to one can be used on the other. The *difference* is subtle. Systems may be naturally occurring. Systems modeling and analysis is more often spoken of in the context of *reactive* modeling. Figuring out how something already works. Whereas **architecture is about design**. It describes how a thing is structured and *why*. Systems models also tend to be more all-inclusive, whereas architecture models are a bit more selective of the [[Pareto Principle|80/20]]. Both involve [[Systems Thinking]]. Honestly you could probably use both of them interchangeably in most contexts and nobody would bat and eye. **** # More ## Source - Conversation with ChatGPT