In the Family-oriented Abstraction, Specification and Translation (FAST) do
main engineering process for software production, a member of a software pr
oduct family is automatically generated from a model expressed in a DSL. In
practice, the time and skill needed to make the DSLs proved to be bottlene
cks. FAST now relies on jargons, a kind of easy-to-make DSL that domain eng
ineers who are not language experts can quickly make themselves. We report
our experiences with jargons in the FAST process, and describe the benefits
they provide above and beyond conventional DSLs for software production an
d other purposes.