Hello Wolfgang

\definestartstop [example] [before={\blank[small]}, after={\blank[small]}, style=\tfx, commands={\setupinterlinespace[big]}]

Thank you, Wolfgang, but the 'commands' tag seems to not have no effect at all. Even when explicit value provided. \setupinterlinespace[line=18pt] \definestartstop [example] [before={\blank[small]}, after={\blank[small]}, style=\tfx, commands={\setupinterlinespace[line=12pt]}] \starttext Most models we discussing here are specification of dynamic behaviour of SUI. This behaviour is described in terms of the interactions over time among some entities. The entities in question fall into two broad categories: {\em endogenous} (intrinsic to the SUI itself) and {\em exogenous} (belonging to a system's environment). \startexample All processes that take place inside Earth (and other planets) are considered endogenous. These processes make the continents migrate, push the mountains up, trigger earthquakes and volcanism, and are driven by the warmth that is produced in the core of Earth. Exogenous processes are all taking place at the outside of the Earth. Weathering, erosion, transportation and sedimentation are the main exogenous processes.\stopexample Constants and parameters serve as names for the values that do not change during a simulation run. In the case of a {\em constant}, the assigned value remains invariant over all experiments. Often it is a physical constant, like $g$ -- force of gravity. In the case of a {\em parameter}, there normally is an intent to explore the effect upon behaviour of a range of different values for the parameter. \stoptext Regards, Vyatcheslav