Based on my experience there are several variables in the decision making process and (far too) many of those are non-technical. Together with some customers we tried to describe some of them in a book chapter (www.dsmbook.com). In the dsl-course by @mbarash they are nicely summarized in http://dsl-course.org/dsl-development/ on “Organizing for DSL Development” and “Template for DSL workshop”.
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