id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
work_ca4su7c6qvhwlc65xubezqbyci	A.T. Bahill	Valid models require defined levels	2008	20	.pdf	application/pdf	9646	1569	72	techniques and gives many examples of levels in models, architectures and frameworks. Keywords: modeling; abstraction; decomposition; hierarchy; systems science A common mistake in modeling systems is mixing elements of different levels in the A common mistake in modeling systems is mixing elements of different levels in the we present some generalizations that are meant to help modelers and designers to define levels systems engineers, physical decomposition often offers these levels (Morganwalp and Sage four decades of teaching is creating elements at different levels in the same model; for example Models with use cases at different levels of abstraction will be hard to understand. Mistakes in mixing elements of different levels are common in abstract systems, but not in These are aspects, not levels: a business model, for example, can have a lot be added to the company's model until after its lower-level process areas had already been	./cache/work_ca4su7c6qvhwlc65xubezqbyci.pdf	./txt/work_ca4su7c6qvhwlc65xubezqbyci.txt